[Nektar-users] Question on mesh partitions for post processing.

Hi Everyone, Does any know a smart way to partition to mesh(Nektar XML) file to contain all element in a bounding box? Example: If i have 10x10 element structure mesh on domain of [0,1]x[0,1]. I need to partition the mesh such that, the new partition file has all elements in the region (a,b) to (c,d). Assuming a,b,c,d are in [0,1]. - If there is no command line option for the above scenario, How can I accomplish it using the API? I have tried using the part-only and part-only-overlapping. I am unable to accomplish what I want. Thanks in advance, Ashok.