I have tried and I don't think it you can import your own logos into their standard printing format. Like you said, you can go between their spreadsheets copying and pasting, and you can write results to a text only file to manipulate. But as far as inserting your own headers with logos into their best looking printing format, I have not been able to do that. Somebody else may know how.
Here is from their help on printing, custom reports are more in terms of what results you want to see:
Printing Reports
The Report Printing Options box helps you build your reports. There are standard reports for you to choose from and you may also name and save any report format you custom build. To choose a standard report simply pick it from the Report Name drop down list box by clicking on the drop down button.
To build your own custom report you may double-click on report sections in order to move them from the list of available sections on the left, to the current report defined in the list on the right. You may use the mouse and the SHIFT or CTRL keys to pick multiple sections and then move them with the Add button. How?
You may specify the text color as black or blue. You may choose to have every other line shaded to enhance readability or turn this off so that all the lines print on a white background. You may also select the starting page number. The number shown will be the next page number in the current sequence, but you can override this for occasions where you need to insert your calculation pages into an existing report and you need the page numbering to match. All reports have a footer with version information, the file name and path, and the page number. The single line header option will include the Model Title specified in the Global Parameters dialog along with the date. The triple line header adds company, designer and job number to the header as well as a place to initial any checking.
The Item Options button takes you to the Item Printing Options sub-dialog where you can select member and plate related output options. Member output such as code checks or forces you may specify that you want the data to be listed for each section cut in the member or just for the member ends which can be useful for connection design. For plates you may indicate which surface forces you desire.