On D2, add to the conventional frequency list.
On D3, create an item with Protocol Type "P25 Conventional".
On D4, create talkgroups of interest (populating the P25C TGID column). If you don't know, of don't care about, the TGIDs, create a wildcard item with P25C TGID of 65535 (decimal).
On D5, create a knob position with Receiving Mode of "Monitor Mode", select the conventional frequency and protocol type you created above. Enter the NAC if you know it, or 7FE if you don't. Select your talkgroups at the bottom.
I think that should be it....