you have created a custom format, you can use SAS statements to permanently
assign the format to a variable in a DATA step, or you can temporarily
specify a format in a PROC step to determine how the data values appear
in output. You should already be familiar with referencing a format
in a FORMAT statement.
Another way to assign,
change, or remove the format that is associated with a variable in
an existing SAS data set is to use the DATASETS procedure to modify
the descriptor portion of a data set.
General form, DATASETS
procedure with the MODIFY and FORMAT statements:
PROC DATASETS LIB=SAS-library <NOLIST>;
Here is an explanation of the syntax: ...