Convert A3 drawings of a culvert to an A2 drawing, in AutoCAD.

"CULVERT Designing of precast concrete culverts" (https://rcad.eu/culvert/) and "GCULVERT Cast in place box culvert and pipe culvert design" programs (https://rcad.eu/gculvert/) usually generate viewports with drawings in A3 format, for each view or section. You can see in the following clip how these vieports are placed in an A2 format drawing and what other changes need to be made.
The difficulty lies in the fact that in viewports there are automatically generated drawing scales to fill the viewport, and in A2 format you need standard scales (1:100 or 1:50). Also, in the A2 format, some texts and dimensions (which could be read in the viewports) become too small and must be enlarged manually.
https://youtu.be/cj0K_all2CE