You will need RPFM to see the mod's files and create your own submod:
https://github.com/Frodo45127/rpfm

EDITING UNIT CAPS FROM THE MAIN MOD

- Copy the Main Mod:
Duplicate the main mod file.
Add "@" at the beginning of the submod’s name to ensure it loads before the main mod.

- Remove Unnecessary Tables:

Keep only the following tables:

- Modify Unit Caps:

In the Value column, adjust the caps for the units you want.
Delete all other entries unrelated to your edits.

Your submod is ready!

ADDING CAPS FOR UNITS FROM ANOTHER MOD

- Open the mod you want to make a submod for.

- Create a spreadsheet with the following columns:
1) Unit Key (e.g., wh_main_emp_art_great_cannon)
2) Unit Name (e.g., Great Cannons)
3) Building Key (e.g., wh_main_emp_forges_3)
4) Lord Key (if applicable, e.g., wh_main_lord_trait_emp_karl_franz)

You will likely find these information in the following tables:
db/building_units_allowed
db/main_units

If you cannot find specific keys, contact the original mod authors for help.

Then, add two extra columns to your spreadsheet and create the following keys:

1. Unit Cap Key: This defines the unit's cap.
- Format: vcap_(faction)_(unit_key)
- Example: vcap_empire_wh_main_emp_art_great_cannon

2. Cap Increase Effect Key: This defines the effect that increases the unit's cap.
- Format: increase_vcap_(faction)_(unit_key)
- Example: increase_vcap_empire_wh_main_emp_art_great_cannon

These keys will be used to implement the cap system and cap increases for the selected units.

- Submod Structure:

Copy the main mod file (New_Unit_Cap.pack) as a base.
Delete entries unrelated to the new units/buildings to keep the file clean.

- Rename the Submod:

Add "@" at the beginning of the file name to prioritize loading.


See below the different tables and which ones you will need to edit for the submod:


Assign buildings to grant unit cap increases for the new units.


Add cap effects, following the naming pattern from the main mod.


(Optional) Add additional caps tied to specific faction lords.


Add cap effects, following the naming pattern from the main mod.


Add cap effects, following the naming pattern from the main mod.


These tables list the different races and factions, allowing you to apply unit cap increases to specific factions when buildings are shared between them.

Examples:
- Khorne Units: Unit caps for the Khorne faction also apply to the Daemon Prince faction since it can recruit Khorne units.
- Sartosa Ports: Building a port in Sartosa will increase unit caps for Sartosa-specific units only if you're playing as Sartosa—not as another Vampire Coast faction.

When to Use These Tables:
Most submods won’t require these tables unless the added units are shared across multiple races or factions. If your submod does introduce such units, these tables help ensure faction-specific behavior.


Add cap effects, following the naming pattern from the main mod.


Add cap effects, following the naming pattern from the main mod.


Add cap effects, following the naming pattern from the main mod.


Add cap effects, following the naming pattern from the main mod.