In theory - open the file in S3PE (backup first!), select the PTRN resource, click Grid, Edit, then change the category name to something else. You will need to have a program (notepad will do fine) in the external text editor box in Settings -> External Programs.
Be aware that the category names aren't always intuitive - Miscellaneous is Miscellaneous, Wood is Wood, but Plastics & Rubber is Plastic_Rubber etc.
Also be aware that the problem could be that this is a Create-A-Pattern pattern, in which case you'll need to either install it as a .sims3pack, or extract the textures and recreate it using Pattern Packager.
"On the page, punctuation performs its grammatical function, but in the mind of the reader it does more than that. It tells the reader how to hum the tune." - Lynn Truss, Eats, Shoots and Leaves