Need help with summing up lists

Dear @Ander and @Jean_Pierre_Traets!
Thank you so much for your help. I am still very new to this great tool and I am just learning. I did manage to solve it somewhat different. The table actually calculates the total work effort for all projects that happen to run during the same time of a given project (ie it references back to itself). You would then assume that this work effort is distributed evenly…

Here is what I came up with (in swedish though)…

Have a good one!

Br
Peter

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