What do you mean by edit in rather that edit out?
I usually edit only the best and export them but that don't remove the unused picture off my computer. Whats bugs me is not really the culling to find the best but the "delete everything i will never use" because it take gigabites and gigabites. I think i should have a culling step before my editing. I usually edit straight away jut skipping to the next until i find another keeper and forgot to delete the not as good as the previous one.
As Simon says, just flagging the 'good' shots as you go through, rather than trying to eliminate the poorer shots. Say you have 5 similar shots, you may get rid of 2 that are clearly not so great, and then keep the other 3 and process them all, or umm and ahh between them. The trick is to see the 5 similar shots, decide right away which one is the money shot, flag that one and move on to the next set.
Everyone has their own way of using the myriad tools available, personally now I keep it pretty simple. Flick through in full screen mode, hitting 1 star on the keepers. Go through the whole job like this before going back to the start and processing those that are rated 1 star. When I go back to process I may reject a few more that I thought may be OK at the time - or I may have come across a similar shot from later in the shoot that now means I have an almost duplicate. Once it's all done and exported, filter to show unrated images, select the lot and delete them.
Finally I may use higher star ratings, colours, or collections to pick highlights for different folios, websites, social media use, etc.
ETA I use colours to mark for further editing as well. So images that need combining for panoramas may be flagged red, those that need to go to Photoshop for whatever reason get flagged yellow, etc.