Office 365 Sharepoint List Template Gallery. Create a SharePoint Online Document Library Template. In the Web Designer Galleries column, select List templates.
In the Web Designer Galleries column, select List templates. You will now see template Activated in a list. Now it starting to be much easier.
Install automatically the intrenet, department and team site templates for free.
Basically using CSOM you can create lists using already existing custom templates, but programmatically you cannot create new ones as SaveAsTemplate method is not exposed in CSOM.
Summary: This blog post describes why you do not need the SharePoint Online Management Shell anymore! Templates are an awesome concept in SharePoint! On the top-level site of the site collection containing the list that you want to copy, click Site Settings.