I have created a couple custom plugins based on the org.dita.pdf2 that came with Oxygen as follows:

When I try to produce a PDF from Oxygen, I get the usual menu with all the options:

My question is. How do I add an option so, i.e. it says:
DITA Map PDF - Client 1 --> which will use the org.dita.pdf2.client1
DITA Map PDF - Client 2 --> which will use the org.dita.pdf2.client2
I know I can Duplicate DITA Map PDF and modify certain parameters in there, but not sure how to specify which plugin I want to use.
Thanks for the help