Busy Accounting Software Enhancement

I need an add-on for my Busy Accounting Software. This should facilitate parameterized stock reports and enhanced invoicing functionalities.

Stock Reports:
- I need the stock reports to be categorized by product category.
- The reports should provide details on quantity in stock and stock value.

Invoicing:
- The add-on should enable the use of customizable templates for invoicing.

Ideal skills and experience for the job include:
- Proficiency in Busy Accounting Software.
- Experience with software add-on development.
- Knowledge of stock management and invoicing systems.
- Ability to create customizable templates.