The presented work will show how to use a combination of different software packages from MOLDFLOW® via DIGIMAT® to ABAQUS® to calculate warpage with material models that are user-defined. The procedure to define an anisotropic thermo-viscoelastic material model on a commercial PBT-GF30 is presented. The measurement of the thermal expansion coefficients as a function of temperature and fiber orientation is needed as well as DMA measurements on the pure matrix material to determine the viscoelastic stiffness as a function of frequency and temperature. After performing DMA measurements, a mastering of the curves to one reference temperature is done with a Prony fit subsequently. Besides the thermo-mechanical tests the fiber orientation distribution is required. This can either be obtained by simulating the fiber orientation distribution with one of the advanced models implemented within MOLDFLOW or by measuring the data with a computer tomography and evaluating the scans. The validation of the material model is done in two evolution steps. First by recalculating the DMA curves of the composite taken under different angles to the flow direction and second by applying it to stepwise tensile tests performed on milled tensile bars from an injection-molded plate with holding times on each step, done isothermal as well as non-isothermal in a temperature chamber. Finally, the material model is applied to a real component made from the validated material. It can be shown that the prediction accuracy with this method is superior to the one from MOLDFLOW® alone.