https://sims4studio.com/thread/19060/tutorial-arranging-map-keeping-texture#ixzz66RrQTjXi
Hi in this video I will teach you how to change the UV layout and keep the textures, using only blender
Many creators like to re-arrange the UV layout and then export the UV layout from blender, and then edit the texture in an image editor,
but that is a very inefficient way of doing it, many image editors will compress your texture reducing the quality and you will always be off by a few pixels,
when positioning the texture to the new layout
This method is very easy and it will save you a lot of time, you can see the keys that I am pressing in the viewport and just follow along
I will also teach you how to cut the UV map to utilize more UV space and maximizing quality