Ungrouping individual emails in Mac Mail

Hi,

I know how you ungroup ALL emails (View/uncheck 'Organize by Conversation') - but I just want some emails ungrouped - such as those that have grouped just because the subject is the same - but I would prefer to leave those that actually ARE part of the same email conversation thread to stay grouped.

So can you ungroup selected emails only?

PS. I also tried uncheckingOrganize by Conversatio, then going into Prefs and unchecking Viewing/'Include Unrelated Messages' - quit, restart and re-check 'Organize by Conversations' - which I'd seen someone suggest elsewhere - but this didn't work.