Yep. A very large meet we have attended in the past that was this weekend does that. 4 Girls are predesignated for the team score and you take the top 3 scores. It is meant to even the playing field for the size of teams. Meets like this often also give the option of entering more than one team if you have enough girls. The coaches generally do not like this format, it would be easier if they could designate 4 girls for each event, but when you have to figure out 4 girls when everyone has different strengths and weaknesses it makes it more difficult.
cbifoja- I am glad they do not take the average score of all the girls, I could see that leading to all sorts of problems, gymnasts not getting to compete because they aren't 'good enough,' and girls who are generally at the bottom of their team feeling even worse because they let down the team.