Assign several classes to multiple cells in a table?

Hello,
I've searched this forum and the Internet for hours, but haven't been able to find a solution for this very basic problem. I'm editing a large table with CSS class="basicTable" assigned to it. In my stylesheet there are two classes for cell properties:
num for cells that contain a number
alt for cells with an alternative background colour
I would now like to assign both classes to a group of cells <td class="num alt">...</td>, but not to the complete table. Is there any way to do this other than editing each individual cell? When I select one cell, I can edit the CSS class in the Tag Inspector. When I select multiple cells, all I see in the Tag Insector is the CSS class for the whole table, not for the cells I have selected.
I am editing several large tables each with up to 10 columns and 20 rows, some cells of which are merged. It is really time-consuming to go through each cell individually.
Has anybody ever encountered this issue?

CSS styled Table Columns
http://alt-web.com/DEMOS/CSS-3-color-table.shtml
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Hey guys,
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I think I am ok using 11.2.0.4, if I can get this working it is really important to us, so saying to roll up to 11.2.0.4 for this would be no problem.
The error in 11.2.0.3 was an internal error: [kghstack_underflow_internal_3].
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