Formula to sum a column from a 2nd sheet with 1:many match across 2 sheets

Hello, I am stumped with a cross-sheet formula. I tried the AI tool but only received links to articles on cross-sheet linking, so I'm reaching out to the community for a life line. This is what I am trying to calculate:

Sum [Est. Cost] from sheet: {Construction Estimates Details} only if the values in [Task Name] column matches in both sheets: sheet 1: {Suites 100 & 110 Expansion Plan}, sheet 2: {Construction Estimates Details}. One:Many, I can't figure out.

Here is an image of what I am trying to do:

Thank you for your help, in advance.

-Lisa

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