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I have replaced the sub-assembly with new sub-assembly and the old sub-assembly is no more required. This old sub-assembly and its parts are only used in that particular assembly and no where its used. after checked in everything. I am unable to delete the old sub-assembly and stating error.
Two possible problems:
1) It is possible for Creo to retain a reference to the old sub-assembly - there is a box in the Replace dialog that can be checked to remember old parts.
2) As long as any version of the assembly references the sub-assembly you can't remove the sub-assembly. You have to delete the versions the sub-assembly is in before deleting the sub-assembly.