"Service time manipulation
Teams who promote players in time to receive a full year of service, which is 172 days — so, Opening Day, or very shortly thereafter — have a chance at additional picks in the amateur draft. (If an international draft is agreed to, teams can potentially receive international picks, as well). Players with 60 days of service or less, who have rookie eligibility and are included in two or more of the preseason top-100 prospect lists put out by Baseball America, MLB.com or ESPN, are eligible. If, in the time before they hit salary arbitration, those players go on to win Rookie of the Year, finish top three in MVP voting or top three in Cy Young voting, their team gets an amateur draft pick following the end of the first round. A player can only create one new amateur draft pick for his team over time. But if an international draft arrives, a team can get as many as three total picks: two international and one amateur, with a max of one such pick per year).
A player who has rookie eligibility, opens the season with 60 days or fewer in service time and who is included on two of the top prospect lists gets credited with a full year of service, even if they were promoted too late on the calendar to otherwise have received it, if they finish in the top two in Rookie of the Year voting in their league. "
this is from the Athletic
I cannot find the full CBA anywhere yet