Hi,
there are a couple of methods for applying properties in various loadcases
however, firstly u need to know which material you got, i.e. isotropic, anisotrop, orthogonal etc.
i give u the input for an anisotropic case i used recently:
MP,EX,1,550 ! Young's-Modul MP,EY,1,10000
MP,EZ,1,550...