This isn’t permitted by the MPA Code of Fair Practice and would not pass the golden rule test (are you doing it to avoid hire/purchase?) If you have hired 30 copies with the intention of people sharing in rehearsals then make copies so everyone can practice at home then you would potentially have 60 being used at any given time - so would be copying to avoid hire/purchase.
However, if extra parts are needed and are not available to buy or hire individually, you can copy up to an extra quarter set (see Orchestral and band parts above.)
