Restrict user on particular field on a specific doctype

Hi,

Can anybody tell how can I restrict a user on particular field on a specific doctype?

You can use a combination of permission levels on fields (via Customize Form) and Role Permissions (permission level property)

Ruchin,

You can set Perm Level for a field, and then set Role Permissions accordingly. Check following link for more info.

https://kb.erpnext.com/kb/setup/managing-perm-level