To open Import session dialog go to Tools > Import Sites on Login dialog.
On the dialog, select if you want to import from PuTTY or FileZilla.
You will receive list of all sites created in the selected application. Next to each site name there is a checkbox. Use it to select sites you would like to import. By default WinSCP selects only sites with supported protocol1), for which there is no WinSCP site with the same name. You can alter the selection as you like.
For PuTTY, WinSCP looks for sites in registry. If you use PuTTY clone, you can configure WinSCP to look for its registry keys instead.
For FileZilla, WinSCP looks for sites in
The checkbox Import cached host keys for checked sites makes WinSCP import SSH host keys from the source application cache for hostnames from all selected sites. So you do not need to verify again the SSH host keys that you have verified in the other application already.
When you finish your selection, press OK to import the sites. Note that when the name of imported site collides with name of an existing site, WinSCP appends number to the end of the name to name it unique.
For session options that the source application does not have, WinSCP will use the defaults.
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