Hi,
you can manage this with conditions, for example:

I have these fields
- Field A
- Field B
- Field C
- Field D


Create a select field with 2 options
1|Profile 1
2|Profile 2

I want to have Field A & B only for profile 1 and Field C & D only for profile 2, so I need condition on select field like these:
- if equal to custom value 1 show Field A and Field B
- if equal to custom value 2 show Field C and Field D

with conditions you can also add profiles to Joomla Usergroups, so you can set conditions like these
- if equal to custom value 1 show Field A and Field B and add to usergroup "profile 1 group"
- if equal to custom value 2 show Field C and Field D and add to usergroup "profile 1 group"

NOTE: all condition have two way so if condition is not met "show" condition become "hide", so for example
- if equal to custom value 1 show Field A and Field B and add to usergroup "profile 1 group" else hide Field A and Field B and remove to usergroup "profile 1 group"

You can also create 2 registration form, read this topic for more info https://www.easy-profile.com/support/create-2-profiles-based-on-two-different-user-groups.html#reply-5785

If you explain me your scenario we can be more precise