Hi @fhas33
unfortunately it is not possible... there is a feature request Form design: grid of text or numeric input - #30 by Grzesiek2010 (please review and share you thought) but it's not implemented yet.
to achieve something similar I would just use 6 groups with field-list appearances (to display questions on the same screen). Then in each group I would add those four questions. It wont look like a table but it will allow you to collect data.