Did you you read my update to my last email? Anyway, I'll repeat and change my suggestion accordingly:

Why not combine Department, Section and Unit into one field (DSU)? So that

DSU='A1A' means Dept A Sect 1 Unit a
DSU='A1B' means Dept A Sect 1 Unit b
DSU='B1A' means Dept B Sect 1 Unit a
DSU='C5G' means Dept C Sect 5 Unit g

laCond(1)= 'A1A' &&Dept A Sect 1 Unit a
laCond(2)= 'A1B' &&Dept A Sect 1 Unit b
laCond(3)= 'B1A' &&Dept A Sect 1 Unit a
laCond(4)= 'B5G' &&Dept B Sect 5 Unit g

..More array elements
lcFilter=''
FOR x=1 to alen(laCond)
  lcFilter=lcFilter+'DSU='+UPPER(laCond(1))
  if x<alen(laCond)
    lcFilter=lcFilter+' OR '
  endif
ENDFOR
SET FILTER TO &lcFilter

>I'll try things out and then decide what to use based on the results. Thanks a lot to everyone. It was really helpful. You are the best guys
!