Assigning a value to a substitute variable

Hi, I would like to know if it is possible to assign a value to a substitute variable.
This is what I'm doing:
- Prompting user for input
ACCEPT uom CHAR PROMPT 'Enter number of UOM system you would like: ' DEF '0'
(displayed list of options are numbers 0-5)
- Based on input, open corresponding file
(start i:\utc\all\oracle\uom\uom_column_heading_&&uom..sql)
Problem:
- Default selection is 0, meaning use the CURRENT UOM system (a number, 1-5)
- That being said, &&uom must be assigned a 1-5 value in order to open the file that corresponds to the CURRENT UOM system
Let me know if any additional information is needed.
Thanks!

I apologize for the format. I tried to make it more legible, but was not able to. FYI: It appears to be easier to read in "Edit" view.
Thanks, I tried the &&uom := your_function(); suggestion, but I am getting an error. It looks like the "value" of &&uom is being read in the assignment statement, not the variable name.
I have copied the piece of the code, for your reference.
ACCEPT uom CHAR PROMPT 'Enter number of UOM system you would like: ' DEF '0'
DECLARE
v_uom_sys_selection NUMBER;
v_curr_uom_sys VARCHAR2 (50);
v_uom_num NUMBER;
BEGIN
v_uom_sys_selection := to_number(&uom);
v_curr_uom_sys := EG.GET_CURRENT_UOM();
v_uom_num := eg.get_user_selected_uomnum(v_curr_uom_sys);
&&uom := to_char(v_uom_num);
dbms_output.put_line('v_uom_num = ' || v_uom_num);
dbms_output.put_line('&&uom = ' || &&uom);
END;
--prompt "&&uom"
start i:\utc\all\oracle\uom\uom_column_heading_&&uom..sql
Below are the results I get when commenting out the &&uom := to_char(v_uom_num); line. NOTE: the "value" of &&uom = 0.
v_uom_num = 1
0 = 0
If I leave that line in, I get the following error:
PLS-00103: Encountered the symbol "0" when expecting one of the following:
begin case declare end exit for goto if loop mod null pragma
raise return select update while with <an identifier>
<a double-quoted delimited-identifier> <a bind variable> <<
close current delete fetch lock insert open rollback
savepoint set sql execute commit forall merge pipe
The symbol "<an identifier> was inserted before "0" to continue.
Message was edited by:
user449676

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