Some views in some circumstances can be copied within a project and into other projects.
Generally CopyClip and Paste is used.
PLAN VIEWS
Select the view crop boundary of the plan view,
copy to clipboard
Go to the other project
Paste - Aligned to Current View or to Selected Level
If you paste to Current View, it will create a new plan view associated to the same level as the current view; if the original associated level name exists in the new project it may be named 'Temp.Level 1' regardless of the associated level or the original name; if you paste again, it will create a new plan view named 'Temp.Level 2'
If you paste to Selected Level, it will create a new view associated to that level - again named 'Temp.Level 1' (or the next number in sequence), not the actual level number.
It will not copy associated annotation from the original view, unless you select those at the same time as the view crop boundary
It will copy most view properties of the original view, but not an associated View Template, even if that same view template exists in both projects.
AREA PLANS
You can copy Area Plans by selecting their view crop boundary.
When you paste them, they may retain the view name - if the associated level from the view in the original project does not exist in the new project; otherwise it will rename to a temp view name.
You can paste them to multiple selected levels, in which case the views are renamed with a number suffix, which do not relate to the levels that they become associated with - so you need to rename them
SECTION VIEWS
You can copy a section view easily by selecting the section marker in plan (or the section view crop boundary in the section view itself)
When you paste the section into another project you need to remember to go to the same level it was copied from before pasting to Current View (or Selected Level) otherwise the heights will be different.
Section view properties will be copied, with the exception of assigned view templates.
ELEVATION VIEWS
You can copy an elevation view either by selecting the elevation marker or the individual elevation itself; if you copy the whole marker it will include associated elevation views
3D VIEWS
Copy Method 1.
If you have a 3D view open, you can select the view crop boundary, then right-click and copy or else use the copy to clipboard icon from the ribbon.
Copy Method 2.
If you have another view open, you can find the view name (to be copied) in the project browser, then right-click on it and select 'Show Camera'
It will show the camera definition of the selected 3D view (be it isometric or perspective)
Then you can copy to clipboard
Paste Method 1
If you are in a plan view in another project, all you need to do is 'Paste Aligned to Current View' and the identical 3D view definition will be created in the same location.
Paste Method 2
If you are in a 3D view in another project, when you try to paste the 3D view it will not give you the option to paste to the current location.
You have to paste to a Selected level (choose the appropriate one);
if you try to 'Paste from Clipboard' you will not be able to get the view into exactly the same location as it was in the first project - so that is not recommended.
DETAIL VIEWS & CALLOUTS
You can select a callout from a plan, section or elevation view, then Copy to Clipboard
Alternatively you can select the view crop boundary and right-click to copy it
You can then go to the recipient project and paste Aligned to Current View or to Selected Views or Same Place (but not to Selected Levels)
The detail view will be created and a callout placed on the view that you selected; if a detail view of that name already exists it will rename the new one with the next number suffix.
DRAFTING VIEWS
Method 1 - Copy & Paste
Select a drafting view, schedule or sheet in the project browser.
Right-click and choose 'Copy to Clipboard'
Go to the other project
'Paste' from Clipboard
Regardless of where the focus is (Project Browser or canvas), it will paste the view into the other project
Method B - Insert View
You only need to open the project to be copied into, and use the 'Insert from File' command
Then select the project that you want to copy views from - it will list allowable view types, and even preview them.
It will also allow you to copy sheets that have only drafting or schedule views on those sheets.
As soon as sheets have other view types on them (including legends), it will not even list them in the Insert Views dialog box
SCHEDULES
Same as per DRAFTING VIEWS above.
LEGENDS
I have not found a way to copy legend views between projects - legend views do not allow view crop boundaries. So, what you need to do is to create a new legend view in the project, then copy and paste all the annotation objects from the original legend view in the other project.
Make sure that your new legend view is the same scale as the original, otherwise text and symbol size will appear to change.
SHEETS
Only sheets that do NOT have views on them can be copied (but Schedules and Legends are OK).
Same as per DRAFTING VIEWS above.