If you’re taking public transport, the nearest LRT station to Dream Centre is Asia Jaya, on the Kelana Jaya Line. From Asia Jaya, you can either Grab, catch bus no. T878 to PJ33, or walk for about 10 minutes.
If you’re planning to drive, parking within the vicinity will be limited, so do carpool if you can. There are two open-air car parks available near Dream Centre. Below is a map to those car parks. Alternatively, you can park in PJ33 or Symphony Square.