Modify.
Changing what's already there. Bulk operations skip grouped and read-only elements rather than failing — and the reply tells you what was skipped.
Set parameters — one, many, or by location
Three reaches: one parameter on one element; the same parameter across hundreds (one transaction, one undo); or spatially — on elements located in rooms whose name matches.
When: the bread and butter. The spatial one is the star: "doors in corridor rooms" uses real room geometry, not naming conventions.
Rename in bulk
Find-and-replace inside names, across a whole category — views, sheets, schedules, or model elements.
When: naming-convention cleanups after a copy-paste spree.
Find-and-replace is case-sensitive. The reply shows examples of what changed.
Renumber sequentially
A category's Mark (or any numbering parameter) renumbered in sequence — your prefix, your starting number.
When: after the layout settles and the marks are chaos.
Change & swap types
One element's type, or the same swap across many at once.
When: spec changes — every "Partition 100" becomes "Partition 100 FR".
Clone a reference over wrong elements
Pick one correctly-placed element as the reference; Copilot replaces each target with an exact clone — type, offset, orientation — flipping 180° where the target faced the other way.
When: cross-family swaps a type-swap can't do. The classic: replacing every squat toilet with the seated one you've placed correctly once.
Move, copy, rotate, mirror
By vector, by angle about a point, or across an axis — with copy-mirror keeping the originals.
When: precise repetitive geometry — "copy these 3 m up" beats dragging.
Group, pin, join
Model groups from a set; pin or unpin in bulk; join the geometry of two elements so they cut cleanly.
When: protecting datum elements with a mass pin, or fixing the wall-floor join that's been bugging you.
Duplicate views & apply templates
Duplicate any view — plain, with detailing, or as a dependent — and apply a view template to one view or many.
When: documentation production. Duplicate the plan per phase, template them all in one go.