I have done a lot of boards which are rigid in nature. However, my new project requires of a rigid-flex design. I haven't worked on flex boards yet. Can anyone please guide me how to design felxible circuits with Allegro? Any documentation or link would be of great help.
There's some great resources out there.San Francisco Circuits has an excellent page on rigid flex boards and is a fab shop I've used multiple times in the past for some high-end projects:Rigid Flex PCBs
PCD&F has a very informative article on rigid flex design:PCD&F Rigid flex design article
Many other authors have great books and resources on rigid flex design as well. A search at amazon or Barnes & Noble should give you some good results.