Hi Rafael,

I'm afraid that there is currently no method to batch apply a representation file to multiple OA classsification vector files through python. You would need to load the images into Focus and apply a representation file. More information on how to apply an existing representation to multiple vector layers is outlined in the OA Batch Classification tutorial - https://support.pcigeomatics.com/hc/en-us/articles/360034713032-Object-Analyst-Batch-Classification-Geomatica-Banff#h_04e934cb-fe7c-4b08-a783-5e3df02dc3d7

Hope this help!

Sarah