Shift+f4 is one quick way to add it.
Thank you! Just one question. How did you know that? In the Adobe Support never said it. Thanks for your help.
here is the help files when you look for parenting : https://helpx.adobe.com/after-effects/using/layer-properties.html#parent_and_child_layers
To show or hide the Parent column in the Timeline panel, choose Columns > Parent from the Timeline panel menu.
the keyboard shortcuts are here: After Effects keyboard shortcuts reference