I had a client recently ask me to help export contacts that she had on one gmail account and add them to another gmail account. She was having problems with the formatting and I said that I would do it for her and then send her the instructions for future. So while I write out instructions for one person, why not help a few?
At the top left of Gmail you have your Google logo and below that the Word Gmail.
Using the little drop down triangle go to your contacts. If you have your contacts organized into folders and only want to export one of the folders, click on that folder.
This will open a new window that will ask you if there is a particular group of contacts you want to export (so if you forget in the first step, you can do it here).
If you are exporting your contacts to go to another Gmail account, then you may as well choose the Google CSV format. However, if you are doing it just to save them or import them into another program, then choose Outlook CSV. Basically it is just a special Excel sheet that you are creating.
Click Export and it will save it to your downloads folder (or wherever you have set to download files to).
This is very similar to the last step. If you want to create a new Group. Be sure to be in the Contacts section of Gmail and highlight all the contacts you have. This allows the Group icon to show up on the top menu. Click on that icon and the drop down will show any groups you already have as well as the create new button.
Give your group a name and click OK. Make sure you are in that group before you do the next step. This way the new contacts are automatically put into the new group you have just created.
Now you are ready to import that group you saved earlier. Go to the more section again, and this time choose Import.
You will need to browse to wherever you saved the CSV file and then click import. It will import all of the contacts you had, and if you already had a few of them in your contact list, it will list them and ask if you want to merge them.