how to call a plsql script from within a plsql script

@sc_pstemp

oracle 9i/10g/11g
I want to call a sql script within a sql script.

I have a script that checks the temporary tbs.  Depends on the name of the temp tbs, I will call a set of script to create new temp tbs, with different names. 
ie, if the current temp tbs is pstemp, I want to create a new temp tbs named pstemp1.

script 1:
===================
declare
...
begin
...
if this THEN
  @sc_pstemp;
else
  @sc_pstemp_1;
end;
/
exit;
===================
script 2:
===================
CREATE TEMPORARY TABLESPACE CWTEMP TEMPFILE
  'O:\PSTEMP.ORA' SIZE 150M REUSE AUTOEXTEND ON NEXT 2M MAXSIZE UNLIMITED
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 30M;