You can add Vendors to your camp sessions by using the Vendor option. 

You can select the Vendor option in two ways,

1.From the Camp Module

Access Path: Center Dashboard > Camp > Setup > Vendor


2. From Setup 

Access Path : Center Dashboard > Setup > Camp/Event > Vendor

Selecting the 'Vendor' option (From either Camp or Setup module) will take you to the 'Vendor Setup' page. Select the 'Add New Vendor' option present on the upper right corner of the 'Vendor Setup' page to add a new vendor to the camp session.

Fill out the vendor details on the 'Vendor Details' page and select the 'Save' button to save the entered Vendor detail.