I have a model in x_t format and for analysis i want to simplify the model by removing features like fillets and holes..How can i do this?I am looking for methods other than creating another feature over the surface which will fill the holes...
To simplify this you could use a tool such as defeature. 2015 SOLIDWORKS Help - Defeature Tool
For more complex geometry, and if you have surface knowledge, using surfacing techniques can be easier when working with imported geometry to 'fill' in gaps and change features.
Sometimes like you have said it can just be easier and more straight forwards to create a feature which would cover the holes in whilst merging with the rest of the body.
To remove fillets and holes I have found that Delete Face with the Delete and Patch option works wonders. Try using that command and just select the inside surface of a hole or select the fillet surface and see if it works for you.
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