substack behavior

[Byron Turner]

I was under the impression that a mainstack cannot be modified, but 
that substacks could be.  Is there some process involved for text 
changes in fields of substacks to be retained?

Byron


"As democracy is perfected, the office of president represents, more 
and more closely, the inner soul of the people. On some great and 
glorious day the plain folks of the land will reach their heart's 
desire at last and the White House will be adorned by a downright 
moron."
--H. L. Mencken