Legal documents are usually boilerplate, standard forms for a particular purpose, with minimal modifications for the specific case. So preparation of a new document is typically "fill in the blanks" or "copy and paste." Although the partner to which Christine is assigned says "cut and paste" the actual operation is "copy this and use it." Cut and paste as a computer operation implies destruction of the original document. That is not how lawyers work, they do not destroy their boilerplate sources. Lawyers say "cut and paste" because they are lawyers, using that terminology over decades before computer geeks decided "cut" was something different from "copy."