Hi

No, you don't need to make fresh registration for participating in  Karnataka Ayush counselling if you had already registered for karnataka MBBS/ BDS counselling

Fresh registration is required only for new candidates as per information brochure released for Karnataka Ayush counselling. You can login directly with your user ID and password which you had created while registering for karnataka MBBS/ BDS counselling.

The direct link to log in for Karnataka Neet Ayush counselling is provided below
http://164.100.133.71/ugayush2020-5/default.aspx

New candidate can do the registration from 11:00 a.m. 28 January 2020 till 1st February 2021 up to 5:30 p.m.

The link to download information brochure for Karnataka Ayush counselling is provided below

http://164.100.133.71/keawebentry456/ayush2020/20210125192431kannada.pdf

I hope that you find this helpful if you have any other doubt then do let us  know

Thank you