This article also answers:

• How can I share my Chargebee site with my team members?
• Is there a restriction on the number of users for a Chargebee site?
• While adding a site user, how can I set the access level?

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Yes, it is possible to add additional users to your Chargebee site. 

1. Go to Settings >> Team Members and click on the Invite Members option. 

2. Enter the email address and you will see the options to provide them complete access to your account or restrict their access depending upon their role in the company. The limits of the access will be shown as you select the “Assign roles” option. 

Here's a video for your reference.

An invite will be sent to this email address. On accepting this invite, the email address will be listed as a site user.

Note: The number of users allowed for your site will depend on the plan you are on. You can find more information on Chargebee pricing page.