hello and welcome to USA forum
i guess car is a USA car and not HOLDEN, "down under "
sold world wide under 11 names. and 10 engines. gas and diesel.
to remove all timing belts made
you put the engine at TDC mark. first.
our V6s have SOHC and DOHC heads, and i cant guess yours.
3.2 L 6VD1/6VD1W
just 2 engines there, see that "w" , that is the twin cam.
as you can see to work on any cars engine
first know what is there, or blind help will be ,(useless)
if totally corn-fuzed, post a photo of engine.
if in usa, the virtual great FSM (factory service manual)
can be seen at mitchell's DIY
log in and read.?
its all there, every step.
Ive posted the steps here before, for sure.
if you search using real engine name , here you will find it.
i think yours is the 3.2L single cam.
here ill go an internet search for you, and the first hit was.
there are 16steps just for removal
ill post step 9 only (do not skip step 9)
Rotate the crankshaft to align the camshaft timing marks with the pointer dots on the back covers. Verify that the pointer on the crankshaft aligns with the mark on the lower timing cover.
When the timing marks are aligned, the No. 2 piston is at Top Dead Center (TDC) compression.
Align the camshaft and crankshaft sprockets with their alignment marks before removing the timing belt. Failure to align the belt and sprocket marks may result in valve damage.