Question about to place a Elephant in....

[Myrddraal]

So you want to add an elephant unit to thrace. By that I take it you want elephants to be recruitable by thrace right?

Lets use carthaginian elephant african as an example

1. Open export_descr_unit.txt and look for the entry for elephants:

type             carthaginian elephant african
dictionary       carthaginian_elephant_african      ; War Elephants
category         cavalry
class            heavy
voice_type       Medium_1
soldier          carthaginian_elephant_crew, 18, 6, 1
mount            elephant african
mount_effect     horse +4, chariot +8, camel +4
attributes       sea_faring, can_run_amok, frighten_foot, frighten_mounted
formation        7, 11, 13,16, 1, square
stat_health      1, 12
stat_pri         6, 3, arrow, 120, 60, missile, archery, piercing, none, 25 ,1
stat_pri_attr    no
stat_sec         6, 8, no, 0, 0, melee, other, blunt, none, 25 ,1
stat_sec_attr    area, launching, ap
stat_pri_armour  0, 4, 0, flesh
stat_sec_armour  13, 3, flesh
stat_heat        -1
stat_ground      0, 1, -6, -1
stat_mental      8, normal, untrained
stat_charge_dist 30
stat_fire_delay  0
stat_food        60, 300
stat_cost        2, 2520, 490, 260, 380, 2520
ownership        carthage

You need to make the following edits here (highlighted in blue):

ownership        carthage, thrace

2. Now open descr_model_battle.txt and find the entry for carthaginian_elephant_crew (you get this name from the 'soldier' line in export_descr_unit.txt)

type                carthaginian_elephant_crew
skeleton            fs_forest_elephant_rider
indiv_range            40
texture                carthage, data/models_unit/textures/unit_carthage_light_archer_carthage.tga
model_flexi        data/models_unit/unit_carthage_archer_high.cas, 15
model_flexi        data/models_unit/unit_carthage_archer_med.cas, 30
model_flexi        data/models_unit/unit_carthage_archer_low.cas, 40
model_flexi        data/models_unit/unit_carthage_archer_lowest.cas, max
model_sprite        carthage, 60.0, data/sprites/carthage_carthaginian_elephant_crew_sprite.spr
model_tri            400, 0.5f, 0.5f, 0.5f

In this section textures are assigned for different factions. For now, we'll use the same textures, but for thrace. Make the following edits (highlighted in blue):

type                carthaginian_elephant_crew
skeleton            fs_forest_elephant_rider
indiv_range            40
texture                carthage, data/models_unit/textures/unit_carthage_light_archer_carthage.tga
texture                thrace, data/models_unit/textures/unit_carthage_light_archer_carthage.tga
model_flexi        data/models_unit/unit_carthage_archer_high.cas, 15
model_flexi        data/models_unit/unit_carthage_archer_med.cas, 30
model_flexi        data/models_unit/unit_carthage_archer_low.cas, 40
model_flexi        data/models_unit/unit_carthage_archer_lowest.cas, max
model_sprite        carthage, 60.0, data/sprites/carthage_carthaginian_elephant_crew_sprite.spr
model_sprite        thrace, 60.0, data/sprites/carthage_carthaginian_elephant_crew_sprite.spr
model_tri            400, 0.5f, 0.5f, 0.5f

And you're done!

BTW, I suggest you read some of the tutorials in the Modification Guides, Tools & Tutorials database. The question you're asking is quite basic, and you could find a lot of your answers there.

Good luck