We are trying to transform the current XML of our manuals to the DITA structure.

In our documentation we use a so called 'spare parts list', in which each part that can be used in a machine, has a number and a description.

Our manauls for several machines contain some of the parts which are declared in the above mentioned parts list.

In our current XML of the manual, we refer to the parts, declared in the 'spare parts list'.

How can we implement this in a DITA structure?