The following is a quick and easy tutorial that shows you how to add objects to a lattice in Maya. It is useful if you already have geometry with a lattice applied and need to add extra objects to the lattice. Also useful if you want to position geometry in a particular way in relation to the lattice before connecting the two together.
Firstly you need to create your lattice -
Make sure you are on the animation menu set then goto – Create Deformers > Lattice and open up the dialog box.
Set the number of divisions of the lattice that you require.
Set the behaviour of the lattice on points outside of the lattice from the drop-down box.
Next position your object where you want it in relation to the lattice.