SUM Column in Value Exists in Another Table

Hi , Anonymous 

According to your description, you want to get the sum of [Hours] according to the another table the job type hour > 0.

Here are the steps you can refer to :
(1)My test data is the same as yours.

(2)We can create a measure like this:

Measure = var _t =ADDCOLUMNS( ALLSELECTED('Table 1') , "flag" ,
var _id = [ID] var _job=[Job Type] var _t = FILTER('Table 2' ,'Table 2'[ID] = _id)   return
IF(  OR( _job = "Erect" && MAXX(_t, [Estimate Erect Hours])>0 ,_job = "Dismantle" && MAXX(_t, [Estimate Dismantle Hours])>0 )  , 1, 0))
 return
 SUMX(_t ,IF([flag]=1,[Hours],0))

(3)Then we can get the total:

Thank you for your time and sharing, and thank you for your support and understanding of PowerBI! 

Best Regards,

Aniya Zhang

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