Yesterday, the Chairman of the Senate Armed Services Committee, John McCain, R-Az., offered an amendment in the nature of a substitute (S. Amdt. #1003) to the National Defense Authorization Act for Fiscal Year 2018 (NDAA, HR 2810).
The original text of S. Amdt. #1003 is available here. However, the amendment was subsequently modified. It is available in three parts here (Part A, Part B, Part C). The modifications are listed by hand in each of the documents.
What does that mean?
Modifications enable the bill manager (i.e. Senator McCain) to incorporate amendments into the Senate's NDAA without having to vote on them separately. According to the Senate's precedents, "A Senator has a right to modify his own amendment until the Senate takes some action thereon, even to the extent of accepting any proposition offered by another Senator as a part of his amendment."
In sum, Senator McCain is free to modify (i.e. change) his substitute amendment (#1003) to HR 2810 (i.e. House NDAA) for the purposes of accepting other senators' amendments in order to avoid individual recorded votes.