STAAD.Pro HelpModelingM. Properties and SpecificationsM. Section ProfilesM. Prismatic and Tapered Sections M. Prismatic and Tapered Sections You can define parametric sections for use your model. M. To assign a prismatic sectionTo define and assign a prismatic section, use the following procedure. M. To assign a tapered I sectionTo define and assign a web-tapered I section, use the following procedure. Parent Topic: M. Section Profiles