A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Microsoft doesn't support adding new dialog sheets or XLM Macro worksheets in Excel 2016 for Mac. That leaves only one option: insert a regular Excel worksheet. This is the first option on the right-click menu when you right-click on a tab in Excel 2016 for Mac.
Templates are not a sheet type and can not be added via right-click on a sheet tab in any version of Excel.
Templates located in the proper Templates folder appear in the File menu > New From Template dialog.