Okay, now that I understand the question better, you can do this without having to firing up the Excel.
Insert -> Object -> Mircosoft Excel Worksheet.
But if you want a button to click on,
Edit -> Toolbars -> Customize
In dialog, click "Command" tabs.
Scroll down to InsertExcelTable and select that.
You then will get this button in your Normal toolabr (assuming that is what you have selected. If you would prefer another toolbar, there's a drop down list on the bottom of the list that lets you select which toolbar you want the button to go.)
HTH.