How to add partner members to partner community portal in Salesforce?

Hi Deepak,

1. Select the Partner Community User profile. (If you don't see the profile, change the search to All.)
2. Click Add.
3. Click Save

For more check the Url:-

https://trailhead.salesforce.com/en/content/learn/projects/communities_share_crm_data/create_portal_and_users

A partner community portal in Salesforce is a place where you can have all your partner members, partners, and vendors access and collaborate with each other. This can be done by creating a partner portal, a site where you can put your own signup pages, access to login and registration, as well as custom branding as you see fit. In this way, it makes you appear as a more professional and organized business, as well as a collaborative one. Having powerful software behind you can be a big advantage, so if you are keen to have your own partner community portal, simply contact our Salesforce consultants who will be more than happy to assist you in building your own custom partner portal in Salesforce. To get the information on what to choose a Salesforce Customer Portal or a Partner Portal, read this blog