When using the Template Rollout Add-on the following guide might help you.

Configuration

Before trying to create or rollout a template, you need to decide what delimeters to use for template-keys.

Defaults are

%key%

Usage

In any issue you'd like to use as a template, include some template-keys in either the summary or in the description.

I.e.

Summary: Some important issue for %fixVersions%
Description: In %fixVersions% we need to include bla bla bla

Rolling a template out

Once an issue contains some template-keys, the 'Rollout template...' action should be available for that issue.

Note: The first step in rolling out a template, is choosing the 'Target Project', only projects that include the same Issue Type as the template-issue are candidates as a target.

I.e. no "type-conversion" for the cloning is supported.

Next step is chosing the field-values for all those field-keys mentioned in the template-issue.