I have data that looks like this:

Reporting Fraction = A/AB
I would like to model the Reporting Fraction as a function of Period, but use the A and AB columns. In SAS the LOGISTIC procedure supports the following form:
<label:> MODEL events/trials=<effects></ options> ;
In the events/trials syntax, you specify two variables that contain count data for a binomial experiment. These two variables are separated by a slash. The value of the first variable, events, is the number of positive responses (or events). The value of the second variable, trials, is the number of trials. The values of both events and (trials–events) must be nonnegative and the value of trials must be positive for the response to be valid.
Is there something equivalent in JMP's generalized regression platform? My A column represents events, and AB represents trials.