  Analysis-suitable T-splines (AST-splines) are a promising candidate to
achieve a seamless integration between the design and the analysis of
thin-walled structures in industrial settings. In this work, we generalize
AST-splines to allow multiple extraordinary points within the same face. This
generalization drastically increases the flexibility to build geometries using
AST-splines; e.g., much coarser meshes can be generated to represent a certain
geometry. The AST-spline spaces detailed in this work have $C^1$ inter-element
continuity near extraordinary points and $C^2$ inter-element continuity
elsewhere. We mathematically show that AST-splines with multiple extraordinary
points per face are linearly independent and their polynomial basis functions
form a non-negative partition of unity. We numerically show that AST-splines
with multiple extraordinary points per face lead to optimal convergence rates
for second- and fourth-order linear elliptic problems. To illustrate a possible
isogeometric framework that is already available, we design the B-pillar and
the side outer panel of a car using T-splines with the commercial software
Autodesk Fusion360, import the control nets into our in-house code to build
AST-splines, and import the B\'ezier extraction information into the commercial
software LS-DYNA to solve eigenvalue problems. The results are compared with
conventional finite elements. Good agreement is found, but conventional finite
elements require significantly more degrees of freedom to reach a converged
solution than AST-splines.
