Answer / ak

%macro Mtest (mvar);
here its required parameter.
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%macro Mtest(mvar1=abc);
.....
sas statements using macro variable mvar1
here mvar1 can be optional while calling macro Mtest
if parameter value is not send then it takes default value
as abc
.....
%mend;

Answer / shiri

using keyword and positional parameters.

Answer / sheetal

In macro definition you can create required parameters and
using %let or call symput you can create optional
parameters in sas macro

Answer / rajeev

using %let statement

Answer / ravid

By using macros we can crate optional or required parameters

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