Make Rows Repeat Based on New Value

[kz134]

I have 

Date

01-Jan-18

02-Jan-18

03-Jan-18

04-Jan-18

05-Jan-18

06-Jan-18

07-Jan-18

08-Jan-18

09-Jan-18

10-Jan-18

I want to repeat the above dates for some new values A,B,C.

So I want: 

Value	Date
A	01-Jan-18
B	01-Jan-18
C	01-Jan-18
A	02-Jan-18
B	02-Jan-18
C	02-Jan-18
A	03-Jan-18
B	03-Jan-18
C	03-Jan-18
A	04-Jan-18
B	04-Jan-18
C	04-Jan-18
A	05-Jan-18
…	…

[novinosrin · Accepted solution]

data have;
input Date :date9.;
format Date date9.;
cards;
01-Jan-18
02-Jan-18
03-Jan-18
04-Jan-18
05-Jan-18
06-Jan-18
07-Jan-18
08-Jan-18
09-Jan-18
10-Jan-18
;

data want;
set have;
do value='A','B','C';
output;
end;
run;

[kz134]

Thanks so much. What if I have another new set of values (C,D,E). Can I fit both into one code? or Do I have to do it twice? So I want:

Value2	Value	Date
C	A	01-Jan-18
D	A	01-Jan-18
E	A	01-Jan-18
C	B	01-Jan-18
D	B	01-Jan-18
E	B	01-Jan-18
C	C	01-Jan-18
D	C	01-Jan-18
E	C	01-Jan-18
C	A	02-Jan-18
D	A	02-Jan-18
E	A	02-Jan-18
C	B	02-Jan-18
D	B	02-Jan-18
E	B	02-Jan-18
…	…	…

[novinosrin]

Nest it like this--

data want;
set have;
do value='A','B','C';
 do value2='C','D','E';
output;
end;
end;
run;

[Astounding]

If your list of values (A, B, C) is long, it might be more practical to store them in a data set and use SQL:

proc sql;

create table want as select * from date_table, value_table

order by date value;

quit;