I do not think you are going to like this answer, but you asked the question, so here goes.
With no matching tree pattern, it's too ambiguous for a standard DOpus synchronization. And because you do not want all files synched between the two machines, just "some files", the only way I can think of to do this would be to write a script that would use an inclusion list which defines exactly which files in which folders in one machine get synched to what folders in the other machine.
What I am about to suggest is crude and would have to be refined but the basic idea is this (requires Windows NT or higher).
First create a simple text file that has two entries on each line. The first entry being the first file to be synched in the first machine, with the second entry being where it should be copied to in the second machine. Continue building your list until you have all desired files listed. Then you'll need to repeat the process in reverse. In its most simplistic form the contents of inclusion list file might look something like this:
"C:\test folder\Source\fil1.txt"?"D:\dir 1\dir2"
"C:\images\mine*.jpg"?"D:\dir 1\images"
Note 2 things about the above. Each path is enclosed by double quotes and there's a ? between the source and destination on each line. That ? is a delimiter, I chose it because it's not a legal character in a file name therefore it serves as a way for the following script to identify which is the source and which is the destination.
:: begin batch file script
@echo off
for /f "tokens=1,2 delims=?" %%a in ('ty^
pe "C:\Mine\cmd\list.txt"') do (
dopusrt /cmd copy file=%%a TO=%%b)
:: end batch file script
Paste the above script into a new text file and save it where you want giving it a file name that ends with .bat or .cmd
Note in my script example the "C:\Mine\cmd\list.txt" represents the inclusion file previously set up.
Finally set up a DOpus button to run the batch file you just saved and if you did everything right, it'll copy the specified files from each machine to the other putting each in the correct location. Due to the complexity of this I did not futher refine the dopusrt copy command to deal with overwriting existing files, I just used the basic copy command as a starting point.
Now aren't you glad you asked? 