Dynamic fields functionality

Sometimes one doesn't know how much data a user wants to add to their profile.

1) Is there a way to replicate the functionality from Linkedin, when you edit your LinkedIn profile, you can add new positions (jobs you worked at) which in fact gives you new fields to fill in for every Position (Job) you add yourself.
2) Can we add (Joomla) TAG like field types to the profile?

example code for 1: www.codexworld.com/add-remove-input-fields-dynamically-using-jquery/

How can I do this for CB profile?.

1) Is there a way to replicate the functionality from Linkedin, when you edit your LinkedIn profile, you can add new positions (jobs you worked at) which in fact gives you new fields to fill in for every Position (Job) you add yourself.

No, a repeating usage for profile edit fields does not exist yet, but it is planned.

2) Can we add (Joomla) TAG like field types to the profile?

No, there is no tag fieldtype.

How can I do this for CB profile?.

You can't without designing an entirely new fieldtype plugin to handle the display, storage, and ajax responses.