Dear Developers Is there an existing tool or mechanism that can be used to duplicate a "list of pairs" dataset collection, keeping the paired datasets the same but relabeling each pair with a new identifier taken from a user supplied file or list? I've cobbled together my own tool to try and do something like this: https://github.com/pjbriggs/Amplicon_analysis-galaxy/blob/77340d8bb2470a646d... and while it works, it doesn't feel like a good solution as it creates duplicates of the datasets from the first collection and consumes additional disk/quota space unnecessarily. (This is particularly undesirable as we expect that the input collections might be relatively large numbers of FASTQ pairs e.g. 30 or more.) Looking at some of the 'Collection Operations' tools that come with Galaxy, it appears that these are able to create new collections without making duplicate datasets, which seems much better. But these tools work by directly invoking Python classes from the Galaxy core, so I don't know if a similar approach could be used in a non-core tool. Any advice or suggestions are very welcome! Thanks Best wishes Peter -- Peter Briggs peter.briggs@manchester.ac.uk Bioinformatics Core Facility University of Manchester B.1083 Michael Smith Bldg Tel: (0161) 2751482