Use leads to keep track of business prospects. A lead can be an existing customer or a company or someone you have never done business with before.
In the integration between Rental Management for D365 Sales and D365 F&SCM, leads are not synchronized.
For more information, refer to Create or edit leads.
Steps
Sign in to your Rental Management for D365 Sales environment.
Follow the steps as explained here: How to create or edit a lead.