If you are asking about engineering diploma then I would say that you can obviously take admission to btech or UG course related to your diploma provided that you have to qualify the lateral entry examination corresponding to your state as well as you should atleast 45% marks in your diploma in order to be eligible.

To know more about the examination as well as the eligibility for those examination, visit the link provided below:

https://engineering.careers360.com/articles/what-btech-lateral-entry-eligibility

I hope this answer helps.