To remove glyphs from the font, in the Font window or Font Map panel:
Select the glyphs that you want to remove.
Select the Delete command from the Edit menu or press the BkSp (or Del) key on the keyboard.
A dialog box appears asking you if you are sure that you want to delete the glyphs.
Deleting glyphs from the font is now undoable, so remember to save your work before deleting glyphs.