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Is very easy, plots your results as always and then simple click in top of the ACTIVE group and with the right mouse button open the menu and select "Show Full Model" to see results in the full model, or "Show Active Group" to see results in the active group, or if you want to see results in differnt groups simultaneously select "Show Multiple Groups".
The important point is to have the LEVEL MODE = AUTOMATIC, then the range of results in the LEGEND will be only the values of the active group, OK?.
Also please note the nodal/elemental results you see in the "SELECT PROSPROCESSING DATA" form are of the FULL MODEL, not matter you select groups or not, do not get confused, groups are a valid postprocessing tool for see results on each group only, OK?.
sorry i didnt see the last portion of your replly...i also have a doubt - i am interested only in the compressive stress in the plates at the moment....the direct stress(max and min) given in the output - are they represnting the tensile & compressive stresses respectively ?
If you want to see compression-only stresses forget to use vonMises, you need to use "PLATE MinorPrn Stress" to see than maximum principal stress in compression.