Creating several symbols at once (Multi-Add symbols)
An option when adding Symbols to the Symbols panel for a multi-add option, similar to the Asset Export panel.
There is a related request about the ability to placing several symbols on canvas at once:
I know of several workaround we can use today. The most accessible one is a free Create Symbols from Groups script by Toshiyuki Takahashi (gau): https://github.com/gau/create-Individual-symbols