> For the complete documentation index, see [llms.txt](https://docs.buildingtransparency.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.buildingtransparency.org/ec3/main-features/plan-and-compare-buildings/bill-of-quantities.md).
# Bill of Quantities
## Copying Elements & Collections
It is currently possible to copy single-material individual elements of an EC3 project to a different EC3 project. Also, it’s possible to copy collections this way.
But copying multi-material elements in such fashion is not yet supported, you can only copy those inside a particular EC3 project.
To copy an element between EC3 projects, you can do the following.
1. Open an EC3 project.
2. Right-click a single-material element or sub-element and choose Copy Element.
3. Staying in the same browser tab (this is important), switch to Plan & Compare Buildings > My buildings
4. In the project list, click another EC3 project.
5. Right-click a label and select Insert Copied Element.
## Selecting visible columns
The bill of quantities table starts with a set of columns capturing the most useful data. You can reveal additional columns and customize your table using the table icon in the top right corner of the table.
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