If its a plane then your easiest way is to:-

• Write a hierarchy file (manual page 308) to basically list out the groups.
• Bring into Poser with File/convert Hier file
• select each part in turn, go to Object/Properties and deselect "Bend"
• Finally go to Window/Joint editor and set the center point and alignment for each piece that you need to move.

By all means look to see whats included on my Tutorial CD but in this instance I feel that would be overkill :)