How to merge two and more templates ?

 
Hi,

How to merge two and more templates ?
With template1 comes two Trendline , with template2 comes one Horizontal Line.
I want to create a new template, template3 which add template1 and template2.

Thanhs,

Tintin92
 
Template is simple text file like xml. Open 2 notepad.exe with templates and copy-past
 
Thanks Stringo.

But if there was something more easy, I was more better.

Tintin92