read lines from internal table

I have an internal table with three columns say.

emp_id emp_name emp_position

1 abc supervisor

2 xya manager

3 kok executive

i have a selection screen

parameter: emp_id,

emp_name,

emp_position.

now i enter the required fields in the parameter. say

emp_id = 3

emp_name = kok

emp_position = senior executive

then the internal table field should look as follows

emp_id emp_name emp_position

1 abc supervisor

2 xya manager

3 kok senior executive <- see the last column of

last row.

how do we to this.

pls help me