In a mission? Open any specific mission file (.mis) you wish and replace an opposing aircraft folder name with that of the imported plane's folder name. I have taken an excerpt from one of my own WW1 mission files: the navy blue section is your units section and I've marked each aircraft folder
name
i
n red (make sure that you use the specific name of the aircraft's folder that's in the main CFS aircraft folder, not the name from your drop down list in game play). You can, of course, change the weapons load, as well (but will still be limited to the weapons .dp of the specific aircraft you're entering).
[unit.136]
id=2226
type_id=4044
name=%name_string.136%
position_lat=N49 54.2950
position_lon=E2 32.6400
position_alt=472.000
position_pbh=0.0,0.0,15.0
skill=0
level=0
points=0
damage=0
[unit_type.0]
type_id=3018
unit_family=1
name=
RS
allegiance=1
gun_ammo=1600
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.1]
type_id=3019
unit_family=1
name=
AlbJ1-1
allegiance=2
gun_ammo=1800
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.2]
type_id=3020
unit_family=1
name=
AlbJ1-2
allegiance=2
gun_ammo=1800
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.3]
type_id=3024
unit_family=1
name=
AlbJ5-1
allegiance=2
gun_ammo=1300
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.4]
type_id=3044
unit_family=1
name=
RB
allegiance=2
gun_ammo=1300
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.5]
type_id=3045
unit_family=1
name=
Dr1J11
allegiance=2
gun_ammo=1600
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.6]
type_id=3046
unit_family=1
name=
Dr1J5
allegiance=2
gun_ammo=1600
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.7]
type_id=3062
unit_family=1
name=
sopcamel
allegiance=1
gun_ammo=1600
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.8]
type_id=3068
unit_family=1
name=
AlbJ5-2
allegiance=2
gun_ammo=1000
cannon_ammo=0
rocket_load=0
bomb_load=0
addons=0000000000000000000000000000000
[unit_type.9]
type_id=3070
unit_family=2
name=
Scout
allegiance=1
gun_ammo=1300
cannon_ammo=0
rocket_load=0
bomb_load=1
addons=0000000000000000000000000000000
[unit_type.10]
type_id=3073
unit_family=2
name=
Se5a
allegiance=1
gun_ammo=1300
cannon_ammo=0
rocket_load=0
bomb_load=1
addons=0000000000000000000000000000000
[unit_type.11]
type_id=3075
unit_family=1
name=
AlbJ5-3
allegiance=2
gun_ammo=1000
cannon_ammo=0
rocket_load=0
bomb_load=1
addons=0000000000000000000000000000000
[unit_type.12]
type_id=4020
unit_family=4
name=Broad leaf tree2
allegiance=1
gun_ammo=0
[unit_type.13]
type_id=4029
unit_family=4
name=Br_apt4
allegiance=1
gun_ammo=0
[unit_type.14]
type_id=4032
unit_family=4
name=Br_hse0
allegiance=2
gun_ammo=0
[unit_type.15]
type_id=4044
unit_family=4
name=church1
allegiance=1
gun_ammo=0
[unit_type.16]
type_id=4045
unit_family=4
name=doveCot0
allegiance=1
gun_ammo=0
[unit_type.17]
type_id=4050
unit_family=4
name=AAA_gun
allegiance=1
gun_ammo=0
[unit_type.18]
type_id=4080
unit_family=4
name=shed0
allegiance=1
gun_ammo=0
[unit_type.19]
type_id=4081
unit_family=4
name=shed1
allegiance=1
gun_ammo=0
[unit_type.20]
type_id=4087
unit_family=4
name=wrhse0
allegiance=1
gun_ammo=0
[unit_type.21]
type_id=4088
unit_family=4
name=wrhse1
allegiance=1
gun_ammo=0
[unit_type.22]
type_id=4089
unit_family=4
name=wrhse2
allegiance=1
gun_ammo=0
[unit_type.23]
type_id=4090
unit_family=4
name=tent_rnd
allegiance=1
gun_ammo=0
[unit_type.24]
type_id=4250
unit_family=4
name=AAA_gun
allegiance=2
gun_ammo=0
[unit_type.25]
type_id=4261
unit_family=4
name=revntmnt
allegiance=1
gun_ammo=0
[unit_type.26]
type_id=4290
unit_family=4
name=tent_rnd
allegiance=2
gun_ammo=0
[unit_type.27]
type_id=4293
unit_family=4
name=tent2
allegiance=2
gun_ammo=0
[unit_type.28]
type_id=4400
unit_family=4
name=Am75mm
allegiance=1
gun_ammo=0
[unit_type.29]
type_id=4404
unit_family=4
name=AmFordTr
allegiance=1
gun_ammo=0
[unit_type.30]
type_id=4471
unit_family=4
name=factory0
allegiance=1
gun_ammo=0
[unit_type.31]
type_id=4487
unit_family=4
name=wrhse0
allegiance=1
gun_ammo=0
[waypoint_path.0]
id=5000
waypoint.0=0,0,N49 53.90,E2 36.00,2500,,,,150,,0
waypointname.0=%waypointname.0_string.0%
waypointtip.0=%waypointtip.0_string.0%
waypoint.1=1,1,N49 53.45,E2 34.57,2500,,,,150,,0
waypointname.1=%waypointname.1_string.0%
waypointtip.1=%waypointtip.1_string.0%
waypoint.2=0,1,N49 52.90,E2 31.95,2400,,,,150,,0
waypointname.2=%waypointname.2_string.0%
waypointtip.2=%waypointtip.2_string.0%