You can link up to a maximum of 5 bank accounts, i.e 1 primary bank account to your Dhan account, and the rest will be secondary bank accounts.

All verified bank accounts linked to your Dhan account can be used to add and withdraw money. The Dividends, Referral & SEBI pay-outs (monthly/quarterly), if any, are credited to the primary bank account.

Follow the below mentioned path to add secondary bank account to your Dhan Account
Login to Dhan app>Money tab>Go to Bank page>Click on Add Bank Account.