Well - I do not use the standard template for Cubase.
For Orb Composer Artist the setup is fairly easy. Most starting points you get in Artist consist of about 4 to 5 instruments. Setting those up in Cubase is simple. Just create a rack instrument (I use HALion 6), and create the amount of MIDI tracks that is needed. In Orb Composer you can look at the instruments you are using, and you can get the MIDI output and channel that instrument is using. You then only have to set up the MIDI input and use the transformer (in a very easy way) to select the channel you are using. It only takes a few seconds.
As an example - Use the Pop/Rock template in Orb Composer, and you get four instruments. They are Piano 1, Guitar 1, Synth 1 and Bass 1. If you generate some random stuff you can see that these instruments have the outputs Orb1 - Ch1, Orb 1 - Ch11, Orb 2 - Ch 4 and Orb 1 - Ch 13 respectively. Now set up the MIDI input for Piano 1 in Cubase by selecting the MIDI input (in case of Piano1 it's Orb1) in the Inspector. Then click in the input transformer (orange icon in the Inspector), select Channel Filtering -> Channel 1, activate the rule and close the transformer. Repeat that for the other MIDI tracks and you are done. As said - it only takes about a minute to set this up. It's easy to add more instruments if needed.
You can save the above setup as a Cubase template to start a project. I personally have made some basic templates, so I can start projecs very fast without too much hassle.
And about Orb Composer itself. It's a fun program that can help you to create starting points. Do not expect the software will create a complete song or something. That's not the purpose of this program. In my humble opinion this program is great when you have a "starting block" or "writers block" of some kind (it would surprise me if nobody here had those bad moments here). Do not forget you can configure almost everything to your needs, and you can also inport MIDI, so you can do some keyboard dabbling and import the generated MIDI to see if what happens. All in all it's a fun program to play around with, as long as you do not demand the impossible.