I am only a beginner so could you please keep it simple.
I need to build a spreadsheet for weekly reporting.
I need one column for "number installed to date".
I need another column for "number installed this period" which will add onto the "number installed to date".
Every week I will have to zero out the "number installed this period column", without changing the values in the "number installed to date" column.
Once zeroed, I need to enter new figures for the week, which ideally would add themselves to "number installed to date".
Any help would be much appreciated.

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