Kate - How create a template
By Sunblade

There isn't a specific/native option for this. But a plugin that does something similar.

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First step:

Settings > Configure Kate > Plugins

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Second step:

Mark "Snippets Tool View"

At the right-side of the UI you can see the plugin enabled.

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Now you can use the tool to create a repository and add snippets to it, which works basically as templates.