You can recreate the dimensions that were originally created for the parts in the drawing.
In an open drawing, check that you have set Dimension creation method in this view to Automatically in the drawing viewview that includes selected model objects or an area in the model, that is represented in a drawing
A drawing view is a container for model and drawing objects.
A drawing can include several drawing views, which usually are two-dimensional views, plane views, to the model.
Examples of drawing views in Tekla Structures include main views, section views, single-part views, and 3D views.
Tekla Structures dimensions parts only in views where this setting is set to Automatically.
On the Dimensioning tab, click Recreate all dimensions.
Tekla Structures re-dimensions all views except linked, 3D and key plansmall-scale view in a drawing that indicates the location of an assembly, a cast unit, or a part in the model
A key plan contains the model grid and the assembly, cast unit, or part shown in the included drawing view.
views, and removes all manually created dimensions.