Most requests are already built. Our shop has 107 ready-made solutions: TDL add-ons for a single job (invoice print formats, approvals, billing controls), Excel to Tally importers, business boosters and full industry modules - each one configured for your company, with no price on the page.
To point you at the right one, tell me: what has to happen, and where does it happen now (billing screen, purchase entry, a report, or outside Tally)?