@EAP when u go thru the requirements ng EA for skill assessment , both your supporting documents (employment claimed) and your CDR will be assessed to determine ilang years pwede mo claim sa employment (if you claim 8 yrs- dpat ung docs mo and CDR will prove such). it helps to go thru the engineers australia migration skills assessment booklet pra ma ensure mo u provide all the required docs and details. (engineersaustralia.org.au)
once you fill up the skill assessment form may dropdown dun kung ano ung profession na pinapa assess mo (what field sa engineering). This is a good reference sa points calculator..
w w w.migrationmatters.com/australiapoints.php or alternatively u can check skillselect.gov.au then check mo ung link for skilled migration points test so u can anticipate ur points.
Goodluck and Godbless!