From any form you get a grid for free when you hit the last button on toolbar "Form Navigation" (the one you should see while working with the form).
Building a table control form from scratch:
Create new form in design view (or use any Writer or spreadsheet doc)
Right-click the top-level forms container and add a form.
Get its properties, name it, bind it.
Button "More Controls"
Pick the tool to draw a table control.
Draw the grid, skip the stupid wizard.
Hit button #6 on "Form Design"
Drag some field onto the form and onto the grid as well.
You may replace the new form field or table column with some other control type (right-click>replace with>...)
Explore the other button of "Form Design"
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and add "[Solved]" to the subject line if your problem has been solved.
Ubuntu 16.04, OpenOffice 4.x & LibreOffice 5.x