Is there a trigger in the CSV file for Adding or remove Group Memberships

Is there a trigger in the CSV file for Adding or remove Group Memberships

I would like to automate a task to automatically update group memberships.   Adding users to groups works fine.   Is there a trigger in the csv file that would tell ADManger plus to remove the group instead of add.  

Is it possible to have both add and remove in the same csv file?

Thanks, 

Ryan Dearman. 
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