Yes, it is possible. It can be a bit tricky to implement if you are using Insert>Caption as Word has a habit of taking the settings in that dialog and applying it across all of the other captions at the same time.

If you reveal toggle field codes you can see how each field is coded. In your chapters, there will be two fields along the lines of
Table {styleref 1 \s}-{Seq Table \s 1}

In your Appendix you need a single field
Table {Seq Table \r 1} - to restart the numbering for that Seq field
Table {Seq Table} - thereafter to continue the numbering

You can edit field codes directly and press F9 to update them.

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Andrew Lockton
Chrysalis Design, Melbourne Australia