[Imp]

Mobryan probably a general rule of thumb would be 1 or 2 mortars per inf com. Per 3 inf com add 120mtrs or a battery upto 122mm max. Ignore your tanks for arty assigned or maybe add one batt if have a lot. By batt I mean troop 1 spot 3 or 4 guns not 12-16 guns. You can then add extra support for none meeting engagements based on the needs & these can be larger than 122s or rockets. You will not realisticly normally get huge amounts for a force your size.