Have you tried the STARTPAGE=NO option (see RTF ODS Docs) Also, if you post sample code illustrating your problem - preferably using a SASHELP dataset - it's easier to help. Something like this would work:
ods rtf file="test.rtf" STARTPAGE= BYGROUP;
proc print data=sashelp.cars;
by Make;
var Model MSRP MPG:;
run;
ods rtf close;
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