You can choose a set of templates saved in your sandbox space by using an appropriate sandbox prefix. For example, if you want to preview a version of ⴰⵍⴱⵓⴹ:Test that you have saved as "ⴰⵏⵙⵙⵎⵔⵙ:Foo/sandbox/ⴰⵍⴱⵓⴹ:Test", use "ⴰⵏⵙⵙⵎⵔⵙ:Foo/sandbox" as the prefix.