please clarify my following doubts

1) is ther any link between flow dirction and support location/selection

2)how can i split a big system in to 2 or 3 parts with out deleting remiang system

3)is ther any problm if we are giving the support gap in fraction eg-.5,.6,.7

4) what is the use of struts?

4) how can i avoid use of constant spring (solution)


regard
an