Dude ... this is the only way I have found to do what you are talking about as far as splitting up two trunk groups. It does work albeit a little convuluted on the "deuce" (IPK2)
Follow along
11-01 make 8x = Individual Trk (1 digit)
11-09-02 = make an 8
14-05 = assign trunks to be in trk grp 2 also assign priority
14-06 table 001 1,2 = 2,2 3,4 = 0,0
table 002 1,2 = 2,2 3,4 = 0,0
21-03 mode 1 and 2 = trk grp 2 for each trk in trk grp 2
21-15 make mode 1 and 2 = a 2 for each extension you want to have access to trk grp 2
FINISH HERE
*note: In 14-06 the above is setup so that they can ONLY access trk grp 2, NOT trk grp 1. If you want trk grp 2 extensions to also be able to access trk grp 1 if all trk grp 2 trunks are in use then the following applies ...
14-06 table 001 1,2 = 1,2 3,4 = 0,0
table 002 1,2 = 2,1 3,4 = 0,0
This has always worked for me. Good Luck
Cameron