I've played/imported some tournaments but none of them show any winnings or results.
Hand Histories for most sites do NOT include summary / finishing information, so this is not available for import.
However, from v3.07.2 Beta onwards PT3 has a tournament Auto Detect mechanism which detects as much information as possible from the hand histories (and summaries, where available).
This is able to automatically determine finishing positions (and prizes where the type and payout structure are known or can be detected) for single table tournaments but for MTTs results can only be detected for the final table (as full information about other tables is not available) unless they are in the hand history files or a summary is available.
The amount of information available is still dependent on what is in the hand history files, but some of the gaps can be filled in automatically.
Please read the Tutorial: Tournament Auto Detection for more information.
Full Tilt writes a summary file for tournaments when you close the lobby, and this will be imported automatically as long as you leave the tournament lobby open long enough to get the results.
PokerStars includes finishing positions and results information for players knocked out of tables that you are playing at and this information is imported by PT3.
They also write tournament summary information to a separate file on your computer when you are eliminated from the tournament. You need to configure Auto Import > PokerStars Configuration to read from the folder configured in the PokerStars lobby menu Options > Tournament Summary Options... (Auto Detect should find this OK.) This only records results to the point you were knocked out - if you want full results you will need to request the tournament results by e-mail (PokerStars lobby menu Requests > Tournament History). You can import directly from the e-mail or by saving the contents to file and importing that (see below).
PokerStars will also send you a full Audit file [on request] which PT3 will import (you must request it in .csv format, and import to the original file that is sent to you) to update all of your tournament results (win/loss only - there is no finish position information in these files).
You can request this via the PokerStars lobby menu Requests > Playing History Audit.
To get full results imported you need to enable the Overwrite Tournament Summary Data option on the Manual Import tab. Since this will overwrite a lot of information it is strongly recommended that you make a Backup of your database before you do the import.
iPoker hand history files include summary information once the lobby is closed and this will be imported.
Everest hand history files include position and prize information, but not buy-ins.
OnGame specify the total buy-in amount (buy-in and rake combined) but not finish or prize info.
888 write a brief summary file with the buy-in and your finish position and prize, but no opponent information.
Some other sites will email summary information to you and you can use the "Import From Email" function on PT3's Manual Import tab to import the summary directly from your email server.
You need to do this before your email application downloads the email or it will be removed from your mail server and PT3 won't be able to access it any more.
Guide to configuring email settings
Party Poker will email you a summary of SNG results, and these can be imported directly from your email server (see link above). You can set this up to be automatically emailed to you for every SNG - see the Party Poker menu: Game Rules and Options -> Auto email SNG Summaries.
Alternatively, when you get the email you can copy&paste the contents, starting with "You requested a transcript of Tournament #1234", into a plain text document and save it to be imported as for PokerStars above.
Cereus will email you the hand history for tournaments and this includes summary information if you request it after the tournament has finished.
In the Cereus lobby choose My Account > Hand History > Request Hand History via Email...
(If you know of any other sites that offer this sort of thing, please PM me).
If you have problems with the email import, you can paste the content of the email into a plain text document and save it.
You can either save it to the HH folder so it is auto imported, or save it elsewhere (like the 'processed' folder) and manually import the file.
This process will be automated in a future version.
Note: Someone has come up with a sneaky way to automate the import of PokerStars tournament summaries.
See this post.
Manually entering results.
Other than this, you will need to enter the summary information into PT3 manually. Tournaments -> Enter Results.
Make sure you click "Save" in the appropriate section after entering data.