Reply To: Advise on Automation (Next Style perhaps)

If a style has been applied to the item you want to search & replace, then yes you can use a GREP find/replace:
Search for r and replace it with n to replace End Of Paragraphs with Forced Line Breaks. These, and many other common GREP items are easy to find if you click the the little @-button at the right of the text field.
Then set the Find Format to the style you've applied (click the T with loupe icon) so it doesn't replace the Paragraph ends anywhere but in the text with the style you choose.

You can also use the Change Format option to set a new Paragraph style if you want or need to.