DAX Measure - SUM sales by part number and multiply by commission rate from related table

[Anonymous]

I have two data sources and I'm trying to write a Measure that will SUM the Sales Amount column and multiply it by the Commission% of the related table. I spent an hour searching for examples of this but I haven't been able to find anything so far. Apologies if this has been solved already.

[Anonymous]

They have a relationship on a column I added in PowerQuery that's [Cust] & [Part] concatenated.

Your suggestion worked brilliantly. Thank you so much.

[AlexisOlson · Accepted solution]

Do your tables have a relationship on [Part]?

If so, then you should be able to write something like this:

SUMX ( Sales, Sales[Sales Amount] * RELATED ( CommisionRates[Commission%] ) )