Userform Listbox to Change Quantity in Cell?

I currently have an order form (workbook A sheet 1) with a userform with listbox that allows me to take all of the necessary information filled out in the form and transfer it to a shipping form (workbook B sheet 1).
What I would like to do is to change it such that a user can single-select the part they need, type in the quantity of which they are shipping it and click the button "add" where the userform clears and the user can add another part from the order to the shipping form. Then, there is another button located on the userform "done" that closes out the userform and saves and closes the shipping form with a unique title.

I have most of the code figured out, besides transferring which parts get to transfer to the shipping form and their new quantities.

I have uploaded the 2 workbooks in here, and the userform code can be seen below.

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I appreciate any and all help!

Never Ever change the default control names until you know a lot more.

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Rule 1. Never Rename your controls, It makes Coding Harder

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The above code enters the numbers 1 to 100 in textboxes 1 to 100
How would you do that if each Textbox has a unique name?


Rule 2. Number Each Control with the Column Number of its Source Data.

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The above code loads Textboxes 1 to 100 with the data in row 1, columns 1 to 100

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The above code Stores Textboxes 1 to 100 in row 1, columns 1 to 100


Rule 3. You can have more than one control storing data to the same cell
or
reading data from the same cell

That is not a problem. As long as they are not the same type of control.

Eg. Textbox1, Combobox1, Label1 can all read / write to the same cell