My dad has been teaching me how to do cash flow analysis. Now I want to add
to that, and add a savings cash flow into this analysis, but I don't know how
to do it. For example, If I save 100 dollars a week, how do I make this add
up over time? And then, If I create a row that details what I have withdrawn
from savings, how can i create a formula that subtracts this number from the
added up total?

I figured it out.

What I did is I had the spendings in C3
The amount I saved in C24
And the total from the previous week in B29.

=B29+C24-C3

If anyone has a better way to do it, please let me know.