nested ifs on different tables

Anonymous so you have 3 tables, in which table you want to add the column and from what table.

Which table has a priority column?

Which table has a duration column?

In which table do you want to add a column, and from what table?

You have to explain everything in detail, you know your model better, not us, having partial information doesn't help at all. Read this post to get your answer quickly.

https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

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