We say an abridgement or first step, for reasons which shall afterwards be explained.
"A Practical Enquiry into the Philosophy of Education"
James Gall
And Percy is an abridgement of Davlin.
"Madeline Payne, the Detective's Daughter"
Lawrence L. Lynch
In addition to his legal business, he translated and compiled many law-books, the most notable being the Great abridgement of the Statutes.
"A Short History of English Printing, 1476-1898"
Henry R. Plomer