Step 1: Under templates select Multi Order Import as per the below screenshot. 

Step 2: Once you select the multi order import the below screen will pop up.

Site: Select the site the import file will relate to 

Multi Order Name: Input the name of the file

Order type(s): Select the type of order eg: purchasing, sales, stock transfer

Choose File: select the file that you would like to upload

Step 3: Press save on the bottom right of the pop-up box. The imported file will then display along with the other templates.