Looking for help with daily auto population of fields

I would like to use a book similar to the one attached to track daily sales of individual products. As seen in the attachment I would copy and past a daily update that is emailed to me every workday to the tab named load daily here. From this I would like to have the other two sheets auto update.
For tab 1 (Inventory List) I would like to add any new data including new items. I know some of the fields would still be blank but they would be filled manually. I would also like the Quantity in Stock column to move to Previous Day Onhand column. Finally on the tab marked Daily Sales I would like to see auto population of rows that changed by date. I would like to keep this data to complete a running total so new data would have to load in the next empty row. I would like negatives that are caused by inventory receipt to equal 0 so it doesn't subtract from sales but when the next day loads I would like to continue tracking sales.
The list of items I am working with is about 500 items so I don't want to auto populate every item everyday.

I am running Excel 2016 now

I hope I have enough detail here and hope the attachment is on this post
Thank you in advance for any help.

Thank you again for the offer to help. Although I have been a member for a few years I honestly have just recently started to use excel to create files rather than just a user of other peoples files. I am really enjoying using Excel and I like to try new things with it and that is why I have come to this site looking for solutions from Excel masters like yourself. I am sorry if I appeared to be looking for free consultancy as that is not my intention, my hope was to get a solution or maybe some help to steer me to a solution, but again I Thank you for your interest in helping me and look forward to more conversation with you and others that may have solutions.

Thank you again for your work on this and for understanding what I am trying to do.

I tried the attached updated file and I keep getting an error when I hit the update tab.

Compile error:
Sub or Function not defined

I am very new to using excel and I am not sure what to do next?
Once I know how it works in the sample file I am pretty sure I can apply it to the working file so again your help would be appreciated.

Remove the word Private from this

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Thank you for the reply Fluff13, I removed the word Private which cleared the error but I am not seeing anything happen in the file when I change data in the Load Daily Here tab. I am sure it is probably something I am doing wrong but would appreciate confirmation if you could check.

Did you select the UPDATE tab?

I changed data in the Load Daily tab then I selected the update tab and see no changes?
I have attached the file with the changes that I made in the hope that someone can help me figure out what I am doing wrong.
Thank you again

Try changing this as shown

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Changed it from 6 to 2 as suggested, I am still not seeing updates on the Inventory List sheet and the Daily Load sheet is changed to currency in the Quantity in Stock column?
I am in all new territory here as I don't understand VB code and I appreciate your patience.

Thank you again and sorry for not being available straight through this project. What you have done is amazing! I am wondering if there is code that could be added to add new items to the inventory list as well. I am hoping for just the info that is loaded in the Load Daily Here sheet can added so if a new item comes into stock it will also start tracking or would this have to be added manually?

Thank you, my actual data has about 500 hundred items and sees phase in/phase out of products as designs change. So tracking sales for both would allow for more complete data capture when I look at weeks, months/years...

I could post the actual file if that would help, I am sure you would be able to see how limited my excel skills are by seeing how I have handled the data so far.

Do you know why I am seeing numbers where currency should be and currency where numbers should be? The columns seem to change format part way down. Also on the Daily Sales sheet the sales column is equal to what I am see on the Inventory List sheet?
To answer the questions you have asked Quantity on Order is in column O and can be filled when the new data gets pasted to the Daily sheet.
Column F =10 (previous number from previous days entry made on Load Daily sheet column E) , Column G = Load Daily sheet column E

Thank you again. I am still seeing some issues like column E Load Daily first 5 entries are showing as currency which I think is throwing data off the first 4 calculation for column G on Inventory List sheet? On Daily Sales sheet I am seeing 0 in column D after loading the items a second time? Is it possible we aren't running the same version of excel.
Please don't think I am complaining, what I am seeing is a file that is almost doing what I asked for. A little more explanation from my side may have made it easier to get to this point.
This file is amazing and maybe it is time for me to try to learn VBA to try to make the changes I want.

Tried this several times and I keep seeing Daily Sales column D populate with Load Daily Here column F. I was hoping to see column D on Daily Sales sheet to equal column F minus column G on the Inventory List sheet, this would have to happen after column G shifts to F and the new daily Quantity in Stock from column E from the Load Daily sheet loads to column G on the Inventory List sheet.

Column O is a totally different measure that might be used later to measure what the minimum should be or to see how often I am buying the item. So on the Load Daily sheet column F could populate 2 in column O of Inventory List sheet and could continue until the item is received which would be added at the data source and would populate E on the Load Daily sheet when pasted in.
On the Load Daily sheet 10 could be the number loaded into E on one day but because there are 4 orders for this item with the source 3 could come in on one day, 4 a couple of days later and before all 10 are in 6 more could be ordered pushing the number that would load in E to 9 again.
Very confusing for me and I typed this, let me know if you need it explained a different way.
Thank you

Thank you for all of the help with my request. I have been studying VBA and I appreciate the opportunity to fine tune this code to be added to my original file.
I really appreciate all of the time and patience you put into my request and hope to work with you again.

Thank you