how to assign data to itab

if suppose i have 2 input fields at selection screen

plant is from vbap mandt (ranges)

kunnr is from vbak (ranges)

fields i have to fetch from vbap is

vbeln, matnr,netwr,werks

fields from vbak tables are

vbeln,auart,kunnr

two itabs : itab1, itab2.

fianl itab: itab3

my o/p should be like dis

vbeln from vbap

matnr

netwr

werks

auart (vbak fields)

kunnr

when user enters plant directly i will fetch my data through

select vbeln, matnr, netwr, werks into table itab 1 from vbap where werks in my_werks.

one  more select query

select vbeln auart kunnr into table itab2 from vbak where kunnr in my_kunnr

now i want to move this both itab1 and itab2 record to my itab3 by removing duplicate value (i know the command remove adjcnt duplct value)

the thing is i want to know how to assign itab 1 record and itab2 into itab3 no duplicate records only unique

which finaly im assign itab3 to alv o/p

note i dont want to use joins i have more fields and 4 other tables im just taking example