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How to copy pointgroup from different time

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i want to copy pointgroup at one frame ,and to use this pointgroup at different time,but when i use it at other time ,it will error, 



gdp = (GU_Detail *)sop->getCookedGeo(context);


GA_PointGroup *point_group =0;


    point_group  = gdp->newPointGroup("_ss_",1);



//append point offset in the group






//now i have a pointgroup


//time set code


gdp = (GU_Detail *)sop->getCookedGeo(context);
the "user_time" is variable 
why ?and how to fix ? someone can help me? thanks!
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