The invention relates to a mold base for a system for injection molding of plastic parts, in particular for automotive body and/or structure components, preferably for baffle and/or reinforcing structures, comprising at least one, namely first, bridge manifold with at least a first and a second bridge manifold opening for feeding material to at least a first and a second sub-manifold of at least one mold insert assembly and at least a first and a second control valve, wherein the first control valve is provided and configured for controlling the material feed through the first bridge manifold opening and the second control valve is provided and configured for controlling the material feed through the second bridge manifold opening.