E-mail template using Guided Procedure

Hi Experts,

I have created the Email callable object and then created e-mail template using HTML Template then assigned to email callable object. In that E-mail template I can change the content dynamically but I am not able to change the subject line dynamically. Is it possible to change subject line dynamically based on action in e-mail template using e-mail callable object.

Please guide me.

Thanks & Regards,

Sundaresan.B