Sorry, it took me a bit of rereading to understand your question, but I think I have it now.
Just to confirm:
You’re saying you:
- Created a template from the entity at the top of the image
- Would like the remaining entities to take the settings of the template that was created at the top
You would like to know:
- Is there an easier way to convert the remaining objects to template other than deleting them and adding them back in one at a time.
If this understanding is correct, I don’t think there is really an easier way. In the use case of the image you posted you could make the process easier by just abusing Ctrl+D on the template to duplicate it quickly, but for more advanced placement I don’t think there are too many good options.