You might want to use one of your current showcases as a template for others. No fear, you don't need to start all over again - you can use the "Copy" function and save yourself some time!
Here's how to copy an existing showcase:
This will duplicate the showcase and after loading, it will be visible in the showcase listing area. Copied showcases are unpublished by default, and the rules in manage access are not copied. You can create as many copies as you need.