How to create a variable pattern in solidworks

i had created a sketch from top plane of 14000mm and extruded it as thin feature of length 2000mm and thickness of 10mm. I want to create a variable pattern of different length and thickness from the first feature and i'm looking for the pattern to get stacked on top of each other. For your reference please check the image file and the pattern i want is not reflecting. Any tips and techniques would be much appreaciated