Final answer:
If an assembly is manufactured in a single work center without any intermediate steps or processes, but the bill of material has multiple levels, the action to be taken would be to coordinate and manage the procurement of the components from different sources.
Step-by-step explanation:
An assembly manufactured in a single work center without any intermediate steps or processes means that the entire assembly is produced in one place without being sent to different work centers for additional processing. However, if the bill of material for the assembly has multiple levels, it means that the assembly requires components or sub-assemblies from different sources. In this case, the action to be taken would be to coordinate and manage the procurement of these components from the different sources to ensure that they are delivered to the single work center in a timely manner.