Grouping observations into new integer variable

[CatM]

I have a group variable that has 3 values. I want to convert it into a variable that has 9 values. I want to know that those in oldvar=1 became newvar=1,2,3, oldvar=2 became newvar=4-6, and oldvar=3 became newvar=7-9. However, within oldvar=1, the observations that take newvar=1, 2, or 3 can happen randomly or can happen where the first third become newvar= 1, the second third become newvar=2, and the last third become 3. 

thanks!

[PaigeMiller]

One solution

data want;
    set have;
    if oldvar=1 then newvar=mod(_n_-1,3)+1;
    else if oldvar=2 then newvar=mod(_n_-1,3)+4;
    else if oldvar=3 then newvar=mod(_n_-1,3)+7;
run;

which can be simplified to

data want;
    set have;
    newvar=mod(_n_-1,3)+(oldvar-1)*3+1;
run;