Cells
Placing a cells is similar to placing [[lines] in that both are elements. First you store the cell into a variable then you put that variable into the drawing.
Dim oCell as CellElement
It makes sense that you would need a point defined just like when your draw a line. But you also have to have a special kind of point called a scaling point and because you can bring a cell in at an angle, you also need a rotation matrix. If you want to keep it simple and bring the cell in at a scale of one with no rotation you can set up a point variable and a matrix and then set them to some standard values like this:
Dim ptScale As Point3d Dim oMatrix As Matrix3d ptScale = ActiveSettings.Scale oMatrix = Matrix3dIdentity