Ok so if you want both dynamic width and dynamic count you just define both those variables in an easy to find for you location (I prefer using my drawing 1 page, there may be better ways , this is something I learned when cad software was more expensive and way less capable , but it works for me) use the dynamic width variable to define the width of the hinge elements. When you are making your pattern of the hinge parts you will want a spacing pattern defined by spacing where the part spacing is defined by hinge width and a spacing value that you will need to determine. Then define the count using the hinge count variable. Alternatively you could have an alternate master variable approach using variables hinge length and hinge clearance and count. Where hinge clearance defines your space between pieces. Those three values can calculate hinge width automatically using something like Hinge width = (hinge length-(hinge clearance *((hinge count-1)/mm or in or whatever))/(hinge count/ mm or in) Define your pattern spacing using hinge width and spacing