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To save a layer as a template, go to the Misc tab in the Layer properties. In the Template section, select which user groups should be able to see the template and then click Generate. This will create a template with the same name as the current layer. The template will be visible in the Templates tab in the Load Content dialog.
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Create a Layer from a Template
To use a template, click Add Content > Load and select the Templates tab. Click on the required template in the list. A layer will be created and added to the layer list.
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