Thank you for your comments everyone,so far 
I have also used a instrument track, say with a Kontakt player and then added instruments in that, and then several midi tracks linked to each instrument . And put the whole lot inside a folder,to keep everything tidy.
And found this method much quicker to set up,and more convenient
I have seen other videos where people have used multiple Kontakt players with only one instrument in each one.
Which personally is a waste,and potentially run the risk of taxing your RAM and CPU in the process.
Been using Cubase for just over a year now and gradually getting to grips with everything 