They cut his work a lot, and he couldn't do much about it.
His first book of poetry, Tulips and Chimneys (T&C), was especially edited. The original manuscript contained 152 poems, but only 86 were actually published in the books. The others were published two years later in 1925 under the title '&' - Cummings wanted the original book to be titled 'Tulips & Chimneys (with an ampersand)' but was overruled by his editor - Thomas Seltzer. Thomas changed the title to just Tulips and Chimneys, and then published the later poems under the title & (changing 'ampersand' to just 'and')
When Cummings reviewed the cut-down T&C, he was unhappy. However, he conceded, but insisted that the original order of the poems was kept.
So in answer to your question - yes, they knew about his intent and disagreed. I assume thy had conversations about it though.
Sources: 1, 2, 3 and 4