Hi Tracy, you can totally do that using the InStr function, so it would look like InStr(DW_DOCUMENT_TYPE, "6y")>0 because you're telling it to go looking for 6y and return the position it finds it in DW_DOCUMENT_TYPE and if that position is greater than 0 then it's there.
btw, here's the link I have bookmarked that will take you to the workflow expression parser for the DW version you're using:
Workflow Expression Parser in help.docuware.com. You'll find InStr in there as well as a whole bunch of other useful expressions and functions.