Absolutely. When you add new contacts to the phone, you should be able to select the account to associate the new contact with. Select the account that your other contacts are stored with, and you'll be good to go. If the contacts currently on your phone are not associate with a Google account, follow these steps:
- Open the Google Contacts desktop site.
- On your phone, any contacts you can identify as unassociated with your Google Account (i.e. local contacts, SIM contacts) should be added using the desktop site you have open.
- At this point, I would go through and remove or delete as many of these unassociated contacts as you can.
You should also be able to export your local contacts or SIM contacts to a file (likely a .VCF file), transfer that file to your computer, and import that using the tools on the Google Contacts desktop site. For what it's worth, here's the basic process for inspecting and modifying your contacts from the Google Contacts desktop site:
- Export a CSV (comma-seperated value) file from the Google Contacts site.
- Edit the CSV in Excel (or similar spreadsheet application) to remove unnecessary or otherwise unwanted fields, correct errors and abnormalities, unify formatting, and add missing entries.
- Delete all contacts on the Google Contacts page, and either perform a manual sync on your devices or allow a brief period for changes to propagate to them.
- Import the modified CSV file to Google Contacts, and let it sync to your devices.