Hello everyone

I had  posted this question before and I thought I had it figured out but I didn't.  

I am linking massive amount of document via workflow.  I dragging files into a folder and the files with specific field link together.    My workflow creates 2 links for each documents.    Than I created another workflow to delete the extra link, but I can not get it delete only the extra link, it delete all links.   I have two questions:

1. I didn't see Group Link in Workflow and I was wondering if I can create a group link to substitute my linking process?

2. How can I delete duplicate links using delete link activity in workflow? 

Thanks