FormsCentral doesn't have a "table", you could use "Multi-line Text" fields with the labels "Top" but it will not look like a table.
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Question along a fairly similar line - if I am trying to create multiple fields on a line, but don't want to add text to each field (i.e. only text at the start of the line, and then multiple blank fields to fill on the line), how would I do this? Image below may make it clearer - want a box below 2012, 2013 and 2014, but don't need to write 'Turnover' next to each one. Thanks