HI Gaurav,
Are the dimension members represented by Row1 - Row4 leaf-level elements? If so, you may be able achieve what you need via the following:
1.) Add an attribute called "Important Rows" or something like that in the alternate hierarchy section for the dimension that contains the relevant rows
2.) Check the "Important Rows" attribute for the rows you want to include
3.) Choose the "Important Rows" member as the key value for the key that's bound to the Data Manager.
I'm pretty confident this would work if your display object was a grid, but I can't say for certain whether or not it'll work the same for a bar graph.
Best,
-Mike