Those are for assigning "Object ID" values to the created TSYS and TGRP objects. If you leave them at the default of "-1", Win500 will choose the object IDs.
The TSYS Object ID field is also used if you're importing only talkgroups into an existing TSYS. Setting that field to the Object ID of an existing TSYS, without selecting any sites or frequencies, will add the selected TGRPs to that TSYS.
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