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Welcome to the Bunnings Workshop community @Akbarfarhan. It's amazing to have you join us, and many thanks for your question about melamine board.
Unfortunately, 1800mm high is the largest Colourboard the manufacturer produces. You could potentially glue inBuilt 3mm x 2440 x 1220mm Melamine Colourboard onto a sheet of Trade Essentials 2400 x 1200 x 16mm Standard Particle Board Panel and then cut it to your required size. We also have the edging to suit as well. However, that might be a bit more work than you were anticipating.
Were you able to construct the robe shelves out of two sheets of Colourboard and connect them together with a batten over the join? Perhaps this could be a location for a shelf to conceal the join. I've put together a rendering of a unit where you could join sections. If you were to construct an 1800mm unit, you could then place a 400mm high unit on top to reach your 2200mm. I've illustrated the two sections in different colours.
Please let me know if you have any questions.
Mitchell
