Hi,
try this:
=SUM(Tab1:Tab2!A1)
My proposal (might or might not be suitable for your case) is however to create a "FirstTab" and a "LastTab". Both of them should be empty. Place all your month-tab inbetween those two. Change the formula above to:
=SUM(FirstTab:LastTab!A1)
Otherwise you might need to change your formula every month.
Kind regards
Bjorn
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