I cycled part of the Transandalus (https://www.transandalus.org/#!/) in Spain a couple of years ago and I'm thinking about going back to the rest of it, except that this time, I want to cycle only on quiet paved/tarmac roads, well graded dirt roads and via verde type paths.  In other words, exactly the kind of surfaces and routes that cycle.travel is  great at selecting.   What I'd like to do is roughly follow the Transandalus route, which is designed for mountain bikes, but do it on surfaces that I can handle on a road bike.  

So, I'm looking for advice about how to use the cycle.travel website to do this.  The Trandandlus is 2000km and cycle.travel objected to the size when I tried to import the whole gpx file at once.  I can certainly break it up, just thought I'd seek advice from more experienced cycle.travel users before diving in.   My hope is to be able to easily compare the original route and the cycle.travel plotted route on a map.