Subtracting from another cell when data changes

Hello All!

I am trying to have a cell that is reflecting the total of projects I am working on to subtract from another cell whenever that cell is change, reflecting that the project is complete. In the screenshot below I want the Total Cell to Subtract the Completed cell. The formula grabbing other data from this sheet looks like this.

=SUM([Column3]1, [Column3]17) (Total Cell)

=SUM([Column3]10, [Column3]26) (Completed Cell)

Any help would be appreciated!


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