Delete full backup without deleting incremental backup

Hi all,

I have following problem: I made a full backup and incremental backups on a disk drive, then duplicated the full backup onto a tape. Due to a space disk problem I need to delete the full backup. When I try to delete the full backup on the disk, BE2012 wants to delete the incremental backups too. Is there a way to link the incremental to the duplicate full backup?

Thx for your help,

Jennifer