The CAESAR II buried pipe modeler may remove added near and mid points on bends but it will not renumber or move existing nodes - it adds nodes for needed soil restraint.
Yes, CAESAR II will remove restraints in "buried" sections but you can add them to the the new model once it is "buried".
The process is this: 1) you build a model as if it was not buried, 2) you use the buried pipe modeler to provide soil data and spawn a new, buried model (the original model froom step 1 remains intact), 3) you can review and adjust the new model and run the analysis using this new model.
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Dave Diehl