You can use your trademark before it is registered, however, you cannot use the Circled R on top of it before it is duly registered. Trademark just means using something that you created for you brand and you may even add the TM supertext too, but do not use the R until it has been registered.
Assignment of a trademark which is not yet registered can be done under section 39 of the trademark act. The marks can be transferred with or without the goodwill of the business associated with the trademark. You can file trademark assignment request with Form TM:P
the government fee for unregistered trademark assignment is 900 Rs.
You can read in detail about trademark assignment through the link below: