Here is one way to do it in a formula:

IF(LEN({Work Types})=0,0,LEN({Work Types})-LEN(SUBSTITUTE({Work Types},“Retouch”,“Retouc”)))

You are removing one character from the string for every appearance of “Retouch” and then counting the difference in length of strings.

However, in these situations I prefer to identify the value in the other table. So I would have a formula in the other table you have rolled up from called “Retouched” that contains:

IF( {Work Type} = “Retouch”, 1, 0 )

You can then roll this field up in the table you posted above and just sum the values.

Thank you @David_Skinner , I feel so stupid having spent so much time trying to figure it out, when the solution was so obvious. It’s really cool having this community to support us noobs haha.!

@David_Skinner I’ve been going crazy trying to figure this out without COUNTIF - thank you for sharing! I know this is months after the original post, but I’m sure a lot of people are struggling with this exact situation.

You can now use conditional Rollup, and just COUNTALL(values). In the Field options, click the rather unobvious toggle "Only include linked records that meet certain conditions":