One approach is to create a table for this kind of thing, and use DLookup()
to read the value from the table.
Create a table named (say) tblConfig, with fields:
VarName Text the name to look up. Primary key
VarValue Text the value to return
Enter records such as:
CompanyName ABC Constructions
Now in your report you can place a text box that has this in its
ControlSource:
=DLookup("VarValue", "tblConfig", "VarName='CompanyName')
For more help with DLookup(), see:
http://allenbrowne.com/casu-07.html