Okay, to get you started I would suggest that you put this formula in D4 of the Graph sheet:
to ensure that it is an integer. Then in D29 you could have this formula:
and this one in M29:
Now, if you change the value in D3 to say 360, then those two Account Balances will also change automatically.
I'm not sure what the relationship is between D4 and your yearly graphs, as you didn't include those in the video (maybe you did, but I've forgotten), but hopefully you can see how it could be included within an appropriate formula.
You will need to do a similar thing for the source range for the graphs, but you might have to set up dynamic named ranges and then refer to the name within the graphs. I don't have time to look at this at the moment.
Hope this helps.
Pete
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