Hey i have a solidworks question for any advanced solidworks users:

i am trying to use the assembly visualization tool in solidworks. its great because in my assembly it will update the information as i am building. the only issue i am having is pulling dimensions into my formulas. what i want to do it be able to type in "length" for instance and then get it to pull the length from each part. i am not sure if that is possible or not but would love any help. Thanks