contacts on my iPad are not being uploaded to iCloud

I have synced my iPad with my Yahoo account. It has downloaded all of the contacts located there. However:

1- The Yahoo sync did NOT include any group information. I.e it downloaded all individual contacts, but none of the groups which existed.

2- These contacts are visible on my iPad, but they are not being uploaded to iCloud when my iPad syncs with the cloud.

The original problem is - how do I get the Groups from my Yahoo account downloaded to the iPad.

"Obviously" If I could get the Yahoo contacts uploaded to iCloud, I could create the groups there. (Which I can do easily enough), but I cannot get the contacts into t he groups.