How to modify cell in grid?

Using advanced horizontal grid on Designer page, I have three fields (Address, City, State) that I want to display in one cell of the grid (Address).

I want to display the fields stacked vertically within the cell, i.e.
VendorAddess
qboVendorBillAddrCity
qboVendorBillAddrCountrySubDivisionCode
Which I think would require a <tr> </tr> for each of the rows.
Is there a way to do this within Designer / Style screen without having to manually edit the CSS?
Thank you