Go to the menu section from the cash app’s home screen
Go to the Manage Balance option and tap on the transfer money
Enter the amount which you want to transfer and select the money transfer speed
Click on the Transfer option to review the details
Click on the Balance once login into the Cash App Account
Tap on the Add Cash and enter the money
Click on the Add option to transfer Money from Venmo to cash app. 
https://www.contactcustomer-service.co/blog/transfer-money-from-venmo-to-cash-app/