With so many different types of lines in Revit, remembering which keyboard shortcut to use for each type of line can get a little confusing. There are model lines, drafting lines, symbolic lines, and family-model lines. Here is a trick: Even though the family editor lines have different commands, Revit will allow them to share the same keyboard shortcuts as your regular line commands. I have my model/family-model line shortcuts set as the “1” key and my drafting/symbolic line shortcuts set as the “2” key.

"1" menu:"modelling-lines"
"1" menu:"modelling-Model lines"
"2" menu:"modelling-symbolic lines"
"2" menu:"drafting-detail lines"