Prices gets automatically active if they are defined in trade agreement and the transaction date is in between from and to date in the trade agreement.
@ Pranav: Thanks Pranav, that is possible in TA however in my case it would result in number of TAs to be maintained.
@ Joseph: Thanks for verifying. I had expected the similar answer for my case, as I don’t see any way to automate. This means a development work would be required if I wish price to get activated automatically?