Add tapes with old Labels

I have Symantec NBU 7.5.0.6  Windows 2003,  pool in standalone tape drive  with the currents  labels:  A00000 - A00028. Tape drive is not tape library.

I was given from other organization six  tapes with  labels:  S0000 - S00005. Information from these tapes isn't necessary.

How to add these other tapes to my pool with labels A00029 - A00034 ?