Create a Userform to Perform this Function - Guidance Please

In the example table you can increase the amount listed in column ‘J’ by entering an amount in column ‘H’ and decrease the amount in column ‘J’ by an entry in column ‘I’. My problem and I am sure it is a case of writers block, is that I can’t seem to translate this function to a userform.

I know the problem here is not as much about knowledge as it is about a foggy brain so any guidance that puts me on the right track would be appreciated.

Example AddSub To Cell - Form.xlsm

Thanks
Scott

I didn’t give enough information before to paint a good enough picture to answer my question. It is possible that this is more difficult than I thought… I will start over and am posting a completely new example.

The purpose of this table is to be able to manually allocate funds between different categories allowing you to take away amounts from one category and add to another. The example is of course clearer. I would like to use a userform to perform this allocation process rather than giving the user direct access to the table. This is an example. The real application will have perhaps 10 different categories.
Sorry for the lack of detail previously.. Hope this is clear.

Scott

Example AddSub To Cell Form(new).xlsm