Copying blocks between 2 different blockset files

Is there a way to copy blocks from Matlab/PLECS Blockset model file to another MATLAB/PLECS blockset. For example I have a script in one blockset file, I cannot use this in another file.

This is not clear, but if you just want to copy a PLECS component from one model to another you can use copy + paste or drag + drop when both are open. Or are you referring to something else?