@Red Eagle of Death said
"In reviewing the Oaths of each Grade I noticed that 0=0 & 1=10 were the only Grades that called for a new Motto. Is the 1=10 Motto used throughout one's career in A.'.A.'. or are there larer Grades in which it is desirable to adopt as new Motto? I know that Crowley had several, but I wasn't sure if that was a Golden Dawn thing."
0=0 and 1=10 are the only places where selection of an aspiration name is required. The remainder is highly personal.
Beginning with 5=6, Crowley selected a new motto for each grade, and used these effectively to distinguish the aspect of himself speaking. On the other hand, George Cecil Jones had only two mottos - one for First Order, one for Second Order.
AC, while in the Golden Dawn, had two: one for the First Order, and another for the Second Order (5=6). That was the default G.D. standard. In the A.'.A.'., he adopted a new one for each grade beginning with 6=5.
My 2=9 oath has the same motto as my 1=10, but, soon after going to 2=9, I had a breakthrough that revealed a new "next step" clarification - a new working formula for me - and I tend to regard that new name as my motto for 2=9 even though it isn't on paper. It served me through the remainder of the Outer College (through Dominus Liminis) and was the setup for the one that came next.
Phyllis Seckler adopted one aspiration name for Probationer and another, Meral, as a Neophyte. As far as the world was concerned, that was the only "magical name" that mattered for her. But by 1980, deep into the Inner College, she'd rearticulated her Will and began using a different formula.
So, as I said... this is highly individual.