In built M-file for S Function?

I created a S function block. But I dont want to store the Mfile in path. If I use only the Level2 M-S Fcn block(Not the respective M file) to some other simulink model then it should work.

Also you can say that I want to create one simulink block which do specific action. I dont want to club some blocks and masking it.

Please provide some suggestions