Hi Ramani ,
To refer to one workbook from another , prefix the cell address with the tab name and the workbook name , enclosing the workbook name in square brackets [ and ].
For example , suppose we have a workbook named WB_A , having a tab name TAB_A , and we want a formula to refer to cell address ADDRESS_A ; in workbook B , in the relevant cell , enter the formula :
='[WB_A.xlsx]TAB_A'!ADDRESS_A
Narayan