You can modify your relationship to do this. You already have a relationship for the table occurrence "Jobs For Projects". If this count is the only time you use this relationship, we can modify it. If it has other uses, you'll need to create a new table occurrence so that "Jobs For Projcects" remains unchanged.
Either way, define a new global field "gType" and include it in your new or modified relationship.
If you modify the existing relationship, you'd get:
<other match field(s) for Jobs For Projects> AND
TableOccurrence::gType = Jobs For Projects::Type
You can then place gType on a layout and format it with a value list of types. Select kitchen in this field and your calculation will count the number of completed kitchen projects.