Maybe. If the various flights are on airlines that use a different booking system than the issuing carrier.
The issuing carrier's record locator will show all the flights in the itinerary.
Other record locators will typically only show a sub-set of the flights.
Often you'll want to know these other locators in order to be able to choose seats on those flights.

For example, my last RTW (in 2017/2018) had:

• the issuing carrier's locator (AA was the issuing carrier)
• a separate record locator for the QR, UL, CX, QF, and BA flights
• another one for the sole IB flight, and
• after I did a re-route to include some LA flights, yet another locator for those flights