At this time, ProSeries is not supporting the Washington Families Tax Credit for tax year 2022. 

ProSeries users are able to log into ProConnect using their ProSeries log in to complete their clients returns there (click here for ProConnect pricing). 

If this credit is something you'd like to see in the program for next year, utilize the ProSeries Idea Exchange. Post, share the link of the Idea on this thread, and others can vote and comment. 

More information on filing at https://workingfamiliescredit.wa.gov/apply 

I hope this helps!