Yes
When you enter each code you can just hit Enter after the Code and then select another one or you can string them together - I do this all the time
For Example in Sheet Layout there is a code for Sheet Count (CT) and one for Sheet Index (SI) if you want to put a Sheet Count on each sheet that is unique to each Sheet then you would do something like this (Sorry I dont have all the Project and Object Codes in my head but it would look like this
Sheet Number (Code 1 (CT)) of (Code 2 (SI)) where Code 1 and Code 2 are the Smart Text Strings created by the Smart Text Process
If I want to have a block of text that looks like the following
Company Name
Company Address Line 1
Company Address Line 2
Company Website URL
Company Email
Company Phone
Company Fax
Then provided there are Codes for each of thee I would simply enter them one line at a time and tap Enter to put a Carriage Return after each and it would come out exactly as shown. Same if you want to Label Easting, Northing, Height or Elevation and Cut / Fill or Station, Offset, Delta Elevation.
When in the Text Field press FI and select the Smart Text Codes link and that will show you all of the Smart Text Codes available - those that you use all the time - I create in a Notepad Doc and have that available to me when I am doing Text Additions to Drawings or Models etc - that way I can apply them quickly as needed
Alan