Polyplex Multi-Out in Logic

Hello, I understand how to click the cog wheel, select each of the 8 instruments in a kit, and assign them to channels 1-2, 3-4. 5-6. etc. The issue is in Logic Pro. With Kontakt, when I open an empty multi, the main channel strip has a plus sign where I add channel strips for each instrument or drum kit piece. When I open a Reactor Multi, no such plus sign exists. Logic creates the individual tracks I specify (8 total) but all are routed to the stereo channel 1. I want 8 stereo pairs - 1 for each of the 8 kit pieces. Is it possible in Logic? How?

Thanks in advance!