Making selected copy transfer its characteristics into an already made style

Question

Hi,
I often have a task of artworking a file from designers into a proper artwork file, where I use a master template with built in stylesheets or styles, as they are called in ID. I always wanted an option to select, say, a heading from a text box and tell it to transfer its characteristics to an already made style on my list.
Example: I copy text boxes from the original design file with all the text broken from their original style (break link to style), effectively making it "No style", into my template and I click in a paragraph and  I want to call it Heading 1, which I already have in my template.
The essence of this need is I use GREP styles in my template, but I don't want the tedious task of manually selecting the font, size, colour and any other characteristic of the selected text into my styles. I want to do two things in one go.
Any help greatly appreciated.

Answer 1

You're still not entirely clear, Are you saying you want to redfine the style to use the font specs from the unstyled text while retaining other attributes, like GREP and Nested Styles?
If that's the case, redfine the styles first to use the parameters you want, then use Find/Change to find the text that has the parameters you want to assign that style to.