The Template Tools page lets you copy templates between accounts. To navigate to Reseller Tools, go to Reseller > Settings & Tools > Template Tools.
Once on the Template Tools page, you may choose a source account and a target account for transferring templates. Then, choose the template(s) you would like to move.
If you scroll down, you can also copy the linked landing and/or training templates. Additionally, you can copy landing/training templates into the target account.
Note: transferring the templates from one account to another will simply duplicate the templates in the target account (the source account will still have the original template).