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You can look at design guides at https://www.allflexinc.com . Design tools are sam as for PCB, it is just additional specifications that you have to pass to manufacturer. If it's just straight jumper cables you are looking for, those can be obtained form number of distributors FFC (FLat Flex Circuit) and FPC (Flexible printed Circuit). For example, www.Digikey.com.
Another one to look is www.minco.com, under literature see "Flexible Circuits Design Guide"