Configuration flow for all NEMA control product is from left to right and top to bottom. There are two sections under NEMA configurators, a) Base - basic unit configuration and b) Mods - custom modification to base unit.

1. Open respective quote and click on the Add Product
   
2. Select LH Contactor
   
3. Complete the configuration for base unit
   
    
4. If Mod options are required, select "Factory Modification" for the Modification type selection, else select "No Modification"
   
5. Select appropriate mods as required.
    

For additional help, please check following COMPAS training video fro NEMA Starter, which has similar flow.