Is it possible to 'cut in' against existing coving when studding out one wall?

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Basic rectangular room with a simple plaster coving. I am thinking to stud on one end (for insulation). That obviously makes the long walls each a bit shorter so is there a way to re-do the corners on the coving in-place instead of removing the whole coving and replacing which would be messy. I don't want to end up with a knock-on effect that the whole room has to be redecorated.
 
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Cut a length of coving from the corner, then put in a replacement length after. Seal the seem using jointing compound and paper tape
 
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Cut a length of coving from the corner, then put in a replacement length after. Seal the seem using jointing compound and paper tape
Sometimes the answer is staring you in the face - thanks. As a DIY hack I'm tempted to use a multitool to plunge cut in place, is there a proper way or is that as good as anything? I'd probably only take out a short section to minimise how much of the existing wall can be affected.
 
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Hand tools give you more precision and less damage. Maybe you can plunge in the middle and sharp knife close the the edge.
 
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Sometimes the answer is staring you in the face - thanks. As a DIY hack I'm tempted to use a multitool to plunge cut in place, is there a proper way or is that as good as anything? I'd probably only take out a short section to minimise how much of the existing wall can be affected.

If were are talking about standard paper faced gyproc coving- I would use a multi-tool to cut 300mm at either end. You need a long enough length to be able to cut the new interior mitres later.

Obviously make sure that you make a note of each of the two sections so that they can marry up to the initial cuts.
 

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