two issues in assign of profile and group

in FTREXT_ASSIGN, there is Z001 profile and Z003 BP group, may I know in SPRO, where can we find the definition of those Z001 and Z003?

I maintain profile and BP group for one business partner, I only add profile to product type 901/buy transaction, after save and come back, I realized

I forget product type 902, 903, but in in FTREXTASSIGN, I find I can't add more product type, there is no "+" button at the right panel, how to add profile to additional product type for that BP?