If you have taken admission in BHMS and if you didn't cancel your admission within the end of the counselling (or the last date of cancellation of admission) then you have to cancel your admission by paying penalty and after that only you can take admission in 1st year Engineering.

You can't transfer BHMS to BTech but you can cancel your BHMS admission and then you have to take admission in BTech.

For more information regarding the career in BHMS you can consider the link below:

https://www.careers360.com/courses/bhms-bachelor-of-homeopathic-medicine-and-surgery

I hope this helps. Wish you a great eve!