You can extract data from the file you are working on, and export it to a new gedcom file. This allows you for instance to share information with other members of your family, without the need to send them your whole file.
From the Tools menu, select Extract..., to open the Extract data dialog box, and select the base individual whose relatives are to be exported. You can choose to extract data relating to all relatives of the base individual; all descendants; or all ancestors and their descendants, except for descendants of the base individual. Click Save to file... and select a filename, and your data will be exported to the new file. All information relating to the individuals and their families will be exported.
After the file has been saved, you can change the character set or encoding of the new file by opening it in GWintree, clicking Header in edit mode, making a new selection from the available options, and saving the file once again.
You can also extract or export data to a new file using the merge/compare facilities, by 'merging' data into a new, empty, file. From the File menu, click New to create a new database (you will need to close the View/Edit interface first). Then from the Tools menu, click Merge/Compare, and select the file from which you want to extract or export data.
You can export selected records to the new file by choosing Selected individuals only from the radiobuttons on the right hand side, selecting each individual in the listbox on the right-hand side, and clicking Select. When you click Merge Data, all information relating to those individuals will be exported to the new file, including family information - but other members of families, if they have not been selected, will not be exported.
Successive merges can be carried out, provided the Clear button is not pressed, or the dialog-box closed. Once one or more individuals have been exported, they will be identified as matched individuals. You can then, for instance, transfer all relatives of those individuals by choosing Related to matched persons from the radiobuttons on the right hand side, and clicking Merge Data once again.
When the process is completed, and the dialog-box closed, you will need to click Save to save the new file to disk.