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You should be using SAFE for this. If you want to do it in ETABS, the best way would be draw piles under the mat foundation or use springs. You can ask Geotechnical engineer to provide your formula for pile settlement or if you don't have that option, assume a 25mm settlement of piles (this analysis might not be very accurate) and divide the load by 25mm to get spring constant and model those springs at pile locations to analyze the raft. You can then design piles manually considering geotechnical and structural aspects. For more information see: Thanks.

Dear Umar Thanks for your reply well i am gonna look into that auto line constraint i.e. what it does. but i resolved the issue some other way around. this is what happened. 1. When i selected all shell objects to mesh them. it so happened that etabs also selected the slab in which i had marked opening. and after the meshing was done etabs subdivided the opening too. 2. when i selected all shell objects to apply loads etabs selected the opening too and applied load on it as well. so when i ran the model check i found the slab label in which problem was present and well it was the opening and etabs could not transfer the load there. so that was the problem. Solution : i deleted the subdivided (Meshed) opening therefore the load applied on it was also gone. then i created the new opening. and there is not warning now.. Thank you again for replying