on the target

• clone the base tempalte with no inheritance.
• ftp to the new {ID} outline folder in custom
• delete all in there
• copy the new outline files to the new target {ID} outline folder
• edit the outline and save both the paticles and the layout. this will create the module posistions in joomla

Other Methods

• Copy the template settings (i.e. /custom/)- https://github.com/gantry/gantry5/issues/1174
• the live github issue for import/export facility - https://github.com/gantry/gantry5/issues/218
• A more indepths method of moving joomla gantry template by moving MySQL databases - https://github.com/gantry/gantry5/issues/1491