C9 allows you to define a part number that is composed of multiple other parts. As a kit. To do this:

1. Goto spares -> Add part.

2. Create your 'kit' part under the accessories franchise.  Make sure qty, maxqty,minqty are all 0.

Note: the kit part must be accessories, but it can be composed of parts from other franchises. You may have a kit composed entirely of KTM parts, but the kit part must still be an accessory part

3. After adding part, go into point of sale, key in the part and highlight it and press F6 to view/modify.

4. You should see below. Press edit kit components to tweak the components.