There are many ways to obtain the same result, but with some patience and this procedure you should get a TM clean from the unwanted entries.
Try the following procedure, described here step-by-step:
1. Make a backup now, or export all the current TM, so that if anything goes wrong with the following procedure you can at least restart from the current status.
2. Go to the menu File, option Maintenance
3. Setup a "Filter"
then click on ADD, and specify the date in the "Criterion" field
Set a suitable date, for example >16/8/2006 (yesterday)
4. Check that you effectively see, browsing the current memory (using "Begin Search" and then Next) only the new unwanted records.
Check the creation date. Note that the date is in the mm/dd/yyyy format.
5. Delete the entries per whole pages.
If you have many entries, set a number of item much higher than the default '5', so that you can remove a larger number of entries each time you click on "Delete".
6. After that all entries having a date higher than yesterday have been removed, click on "Reset", to remove the filter.
7. Browse again the memory, and now you should see only the remaining entries (those existing before your unwanted Import)
If everything goes OK, you can make another backup and start working from here.
If something goes wrong, you can still restart from the backup done at the step 1.
* * *
The method described above is quite simple, but it may be not useful if you are dealing with a very large number of entries to delete.
An alternative method could be to export all entries and run a macro on the txt file, to identify and remove all items having a particular date.
Another way, only valid if you can use a database, you could import all entries in a database, and execute a filtering and delete operation in the database, then export the remaining entries as a starting point.
[Edited at 2006-08-17 01:25]