There are so many issues with repeated measures that it would be very difficult to give you simple advice. The specific experimental layout will decide what model (including random and repeated) statements to use. But you should know that the approach in GLM is different from the approach in MIXED. There is no direct correspondence of the statistics, etc. You really should do some reading on the topic to become familiar with the issues. A good place to start might be: http://support.sas.com/rnd/app/papers/mixedglm.pdf It is dated (a lot of new developments since this was written), but it tells you about some of the major issues. Chapters in the book SAS For Linear Models (by Littell, Stroup, and Freund), 4th edition, should be helpful.
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