Various functions are available in SAP S/4HANA for selecting reservations.
SAP Fiori app Manage Manuel Reservations
SAP Fiori app Manage Reservation Items
SAP Fiori app Display Reservation List or the corresponding SAP GUI transaction MB25 (Reservation List)
SAP Fiori app Manage Reservations or the corresponding SAP GUI transaction MBVR (Manage Reservations)
SAP GUI transaction MB26 (Pick List)
Manage Manuel Reservations App and Manage Reservation Items App
Note the following for these apps:
In the Manage Manual Reservations app, the results list contains one entry for each selected reservation. For example, you can see in the list how many items the reservation contains and how many of them are marked as Completed. Details of individual items are not shown in the list.
With the Manage Manual Reservations app, only manually created reservations can be selected. Dependent reservations, such as reservations for a production order are not selected.
To create a list of individual reservation items, use the Manage Reservation Items app.
In both apps, different filter criteria are available to restrict the selection.
Note
For more information on these apps see the "Creating Manual Reservations" lesson.

