You can save the selected objects by pressing Get Selection command. Even if you perform operations and make other selection operations in between, you can select the selection you have memorized again at any time with the Set Selection command.
Location of the Get Selection Command
You can access it from the ribbon menu Tools tab, Selection Groups title.
You can also access it by pressing the Ctrl+1 keys on the keyboard.
Location of the Set Selection Command
You can access it from the ribbon menu Tools tab, Selection Groups title.
You can also access it by pressing the Ctrl+2 keys on the keyboard.