Manual Remove Bad Incremental Backups ???

I need a solution Win 7-64 SSR 2013 11.0.2.49853 up to date.

I have incremental backup sets that C Drive -020, C Drive -020_i001, C Drive -020_i002 , . . . . C Drive -020_i015, C Drive -020_i016, C Drive -020_i017, C Drive -020_i018. 

I had a problem and needed to restore from the backup named i015.  Since the backup after 015 are "BAD" I would like to remove them.

Can I simply manual remove them or is them a special way to remove them? 

I would like for a new backup set (-021) to start.  Will simply remove the bad backups trigger a new set?