When you have created a workspace template that you wish to share with the organization you can do it through two different paths:
Share template when you are creating it
Share template later on from the template settings
Share template when you are creating
When you are creating a workspace you can configure that the workspace is visible to the organization right away.
Create a template from a workspace in My Workspaces -view
Name your new Template
Select "Organization" under Template visibility inside the organization
Click "Create"
You will be taken to your newly created workspace template.
Share template later on from the template settings
If you have already created a template from a workspace and wish to share with your organization later on. You can do it easily by following these steps:
Navigate to Templates > Workspace templates
Make sure that you are on "My Templates" tab
Find the Template you wish to share
Click on "..." next to the template name
Click "Edit template"
You will be taken to the template workspace
Click "Template settings" on the yellow top bar
Select "Organization" under Template visibility inside the organization
Click "Save"
Now the workspace template can be found in Organization templates for all the admins in the organization.