Set word table row properties in powershell
$rows=6
$columns=2
$range = $selection.Range
$table=$document.Tables.add($range,$rows,$columns)
#set bold font for cell
$table.Cell(1,1).Range.Font.Bold = $true
#set border as visible
$table.Borders.Enable=$true
#set Row height (20 is default)
$table.Rows.Last.Height = 40;
#set value
$table.cell(1,1).range.text = "Web Part"
#Merge last 2 rows (way how to get Row object)
$table.Rows.Last.Cells.Merge()
$table.Rows.Last.Previous.Cells.Merge()