Eugene,
I saw the screen shots that you sent to Scott. The selection box is to choose another Hardwire between two abx. In your case you only have one Hardwire configured between each abx so you will only see one selection.
If you are going from columns to columns of 2 different SCXI-1129 then NISE will select the row, the com and the ab since you marked them as "reserved for routing'. Once the ab is selected it will route to the other SCXI-1129 using the Hardwire created and since there is only one hardwire per abx, only one selection is available.
If you want to use another path and hardwire row->com->ab->HW->ab->com->row then you can change the number of all the rows, coms and abs in the string below the window:
[SC1Mod1_ivi/c0->SC1Mod1_ivi/r1->SC1Mod1_ivi/com1->SC1Mod1_ivi/ab1->SC1Mod2_ivi/ab1->SC1Mod2_ivi/com1->SC1Mod2_ivi/r1->SC1Mod2_ivi/c0]
This will selected the corresponding hardwire.
Guy Ferraro
Switch Product Support Engineer
NI - USA