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Using ArcGIS 10 Network Analyst, I've created small python script that calculates OD matrix between certain locations, i.e. not between each origin and destination but for each origin I have a set of destinations that I want to calculate routes for. I end up with 17 results saved as a .lyr file (don't necessary need to save them on hard drive as such). I would like to merge those results together. The problem is a OD Cost Matrix Layer is in fact a group of layers and I'm only interested in layer Lines.

To sum up: if layer is OD Cost Matrix Layer (group of layers) and Lines is one of the layer in that group and I want to use Merge tool to merge a few of such Lines layers - how do I do it as

arcpy.Merge_management(layer, output)

is obviously giving me an error of input not being a table view.

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The solution was to merge those layers I need a list of OD layer names with "\Lines" added to them. Something like that

layers = ["ODlayer1\Lines", "ODlayer2\Lines", "ODlayer3\Lines"]
arcpy.Merge_management(layers, output)

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