SAP C4C SDK- Custom email with custom template!!

Hi Experts ,

I am in amid of creating an action in standard BO , by which we want to send an email to the owner of opportunity.

I am able to code the action to send an email , but the requirement is that this email should also be having a custom template (in html format).

I am having this custom template with me, do I need to upload it somewhere, how do we use it?

I am unable to attach this custom template from SDK development in absl .

Need some help and sample code if it is there.

Br'

Daljeet