As John said, turn on the Multi-Select. Then it's standard Windows key's.
1. Click first,hold shift, click on last.
2. Use Ctrl To select/un-select individual entires, etc.
With multi select on, you'll need to use the Selected property to determine which have been selected for processing:
https://docs.microsoft.com/en-us/office/vba/api/access.listbox.selected
Jim.