Cells Tab

Under the Cells Tab you have the option to choose the source for each cell (Arrow 1) under Cell Source (PDF, OCR or Custom - see Zone source) (Arrow 2). Under Row Operations and Column Operations, you can Split Rows and Columns (Arrows 3 and 5), or Merge Down/Right (Arrows 4 and 6) to combine them.

Cells Tab.  Arrow 1 shows the cell being edited.  Arrow 2 shows the Cell source (PDF, OCR or Custom).  Arrow 3 Sohws the Split Row Button.  Arrow 4 Shows the Merge Down Button.  Arrow 5 shows the Split Column button.  Arrow 6 shows the Merge Right button.

Tables video.