The 2nd attachment ( Analysis properties ) refers you another issue,How can i shorten the Analysis properties ---> Analytic construction values should be minimized limits (Name is tooo long)
What U R asking is quite tricky
go to C:\Program Files\Autodesk\Revit MEP 2013 or Revit 2014\Program\Constructions.xml
First of all make a backup of that file somewhere, open it in notepad, there U will see code written which will form the building construction in revit.
Using the same format as the pre-defined ones add your wall, floor, roof etc. keep the syntax the same, and keep the ID unique. Here is the xml format
<Construction id="ASHIF5" surfaceType="Ceiling">
<Name>8 in lightweight concrete ceiling</Name>
<Description>8 in (200 mm) lightweight concrete ceiling</Description>
<LayerId layerIdRef="lay-ASHIF5"/>
<U-value unit="WPerSquareMeterK">1.3610</U-value>
</Construction>
<Layer id="lay-ASHIF5">
<MaterialId materialIdRef="mat-AM13"/>
</Layer>
If u want to change name of your ceiling, first find it in the xml file [use ctrl+F] then copy the whole code bunch like shown above paste it below that and give different name to it, which is maked in red[short word]
Then the characters shown in blue R IDs which should be unique for every material, so give different characters to them and save it.
but make sure your new construction material comes below same category i.e ceiling below ceiling and roof below roof.
restart revit, u should get shorter names. but if u open the revit file in other system then it will not show your construction material, bcoz there also U have to edit the xml file.
