Ok, I think I have this right.
Enter your opening stock balance in A2 of the Balance sheet.
Enter this formula in E4 of the Basement sheet.
Right click the sheet tab of the Basement sheet, click 'View Code', then copy the code below into the sheet module.
I think it does what you need.
To add new stock to the balance you should be able to input as a negative in D4, or you could change D4 to 0 and delete the data from column A of Balance sheet and enter the new figure manually to start again with a clean sheet. Whichever suits your need best.
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