Sets created by selecting geometry from a part are called part sets, and you use the Set toolset to create and manage part sets. You can use part sets in the Part module to select regions that should be repaired by the Repair toolset. In addition, in the Property module you can assign sections to regions specified by part sets. When ABAQUS/CAE prompts you to select a region, you can either select the region from the part in the current viewport, or you can select a named part set.
Only part sets are visible in the Set Manager in the Part module. When you instance a part in the Assembly module, ABAQUS creates part instance sets that refer to any part sets that you previously created. For more information, see Understanding sets and surfaces, Section 48.2, and Using sets and surfaces in the Assembly module, Section 13.7.6.