Cutting a slot that is wider than my end mill using axis-substitution

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The width of base slot 5mm and the upright slot 3mm I can cut the vertical part with 18 end mill slotting drill but need 5mm or 316

T slot drill , solid carbide-T-slot insert mill end, ZYL01201005, DIN J6r Solid Carbide T Slot Cutters ideal for cutting all types of materials plywood, hardwood and softwood Standard: DIN 851

china shores slot machine big win Home · Products · SENTOSA MANDIRI TOOL · CARBIDE TIPPED FINISHING END MILL, ROUGHING END MILL; T-SLOT END MILL, DOVETAIL MILLING CUTTER Spotlight · Weldon Shank · For milling, roughing and finishing to make a T-Slot at high speeds and feeds · Variety insert grade available for alloy steel,