Not really. There are only two ways to sync. The default bi-directional, which syncs both so that they are both the same. Or one-way-mode, where the other person can only sync to you. However there are drawbacks to that. They cannot receive any information from you, such as Clients, Projects, Tasks, etc. So that person would have to setup those types of records exactly identical to your, or you would have to use the Import Templates found on our website and import those items into both devices first.
No, it cannot be done "remotely". Sync requires either a Local Wi-Fi or direct using Bluetooth.
If you are using the Invoice module, we do *not* recommend the QB module.