Combining HDF5 files

I collected AMS data continuously over a week. The data produced is in .h5 format and is broken into several files. Now, at the moment, I'm manually opening each of those files in IGOR using the "Open HDF5 file" option in the Load waves tab but this is proving to be too cumbersome. Is there a way to combine all .h5 files into one big .h5 file which I could open in one go in IGOR and browse through all my week-long data together? Thanks in advance! 

Use HDF5OpenFile on each small files, load all the contents with HDF5LoadGroup/R on the toplevel group and store these into separate groups via HDF5SaveGroup into the big file.