I would probably do this in two distinct PROC SURVEYSELECT steps like below.
I made example data set from sashelp.cars and made arbitrary mileage categories for demonstration purposes
data cars;
set sashelp.cars;
length mileage $20;
if mpg_city<16 then mileage='Bad';
else if 16<=mpg_city<25 then mileage='Fair';
else if 25<=mpg_city<30 then mileage='Good';
else mileage='Excellent';
do i=1 to 100; output; end;
drop i;
run;
proc sort data=cars;
by mileage;
run;
proc surveyselect data=cars out=sample1 method=srs n=200 noprint;
where mileage in ('Bad', 'Excellent');
strata mileage;
run;
proc surveyselect data=cars out=sample2 method=srs samprate=0.01 noprint;
where mileage in ('Fair', 'Good');
strata mileage;
run;
data finalsample;
set sample1 sample2;
run;
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