You can simply do that by referring to the codes needed for manhunters party in factions.py , party_templates.py and in trigger.py
there is a code in triggers.py that spawns manhunters party.
(5.7, 0, 0.0,
[
(store_num_parties_of_template, reg2, "pt_manhunters"),
(lt, reg2, 4)
],
[
(set_spawn_radius, 1),
(store_add, ":p_town_22_plus_one", "p_town_22", 1),
(store_random_in_range, ":selected_town", "p_town_1", ":p_town_22_plus_one"),
(spawn_around_party, ":selected_town", "pt_manhunters"),
]),
here is an example if u want to spawn a party called swadianpartol around Suno(p_town_4),(it,reg2,4) is just maximum same parties allowed on the whole map(4 in this case, u could change that number to whatever u like)
(5.7, 0, 0.0,
[
(store_num_parties_of_template, reg2, "pt_swadianpatrol"),
(lt, reg2, 4)
],
[(set_spawn_radius,1),(spawn_around_party,"p_town_4","pt_swadianpatrol")]),