In 6.1 I could browse to them. Now they seemed to be squirreled away somewhere. The old "Template..." pnael has been replaced with some sort of "Library."
When selecting Plot:Template or clicking the Template plot type button on the 2D Graphs Toolbar, the Select Template dialog opens. Scroll through the Category List and select 'My Templates'. You can then select your template from the Template list.
You can also open your template by clicking the 'Open Template' button on the Standard Toolbar. Or select File:New.