After your completion of B.A.M.S ( Bachelor In Ayurveda Medicine Science ) there are several other short term courses where you can purse an extra qualification other than P.G .
Here i am giving some of the important courses which you can pursue after B.A.M.S
1. M.D ( Ayurveda )
2. M.S ( Ayurveda Dhanvantari )
3. M.D ( Ayurved Vachaspathi )
4. M.S ( Ayurveda )
5. M.D / M.S ( Ayurveda vachaspathi )
6. Ayurvedic Pharmacy
7. M.D Strirog & prasoothi tantra
8. Hospital And Health Management Course - Mumbai
9. DGO in Ayurveda in Maharashtra.
So these are some of the related fields where you can go after B.A.M.S , but in my view you must do P.G for the bright future as you can do it by correspondence while you can do practice.