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Create a new template. Do not add it to any to any Template Type Context . and no need to enable it.

Put Specify whatever css or javascript you want to add to include in the file.

## Obtain the template manager
#set($templateManager = $timeTrackingComponentManager.getTemplateManager())
#set($templateCss = $templateManager.getTemplateByKey("mycsstemplate_template"))
 
<style type="text/css">
	$!templateCss.getVelocityFileObject().getContentAsString()
</style>
 

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Or if you only need css or script in one template file, just add it directly to the velocity template file.