Restricting records in a layout
I have a database that summarizes specification requirements for types of material. There are various specifications for one type of material (with a single record for each specification) so I have created multiple layouts, one for each material type. However, these layouts share a number of fields. Right now, If I put a material specification into any layout, I can actually view that specification from any other layout (although it ussually ends up looking pretty weird). What I need to know, is a way to put in each specification so that it only shows in the correct layout for the material type that it is. I have added a drop down list to each layout that contains material types. That way I can use that to lable that record as a aparticular type of material. I'm pretty sure this is the correct first step but I have no idea where to go from here. Could someone please help me out?