OK, Here's where the problem is:

The 1850 SC Census Newberry County lists Allen as son of William Thrift. (I don't have good access to census info so I'm relying on what has already been posted.) Terry has done some VERY good research on this Allen, and from what I can see she is probably correct that Allen's full name is Robert Allen Thrift
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&d...
who married and moved to Georgia. See Terry's posts
http://listsearches.rootsweb.com/th/read/THRIFT/2009-02/1234...
http://boards.rootsweb.com/surnames.thrift/249/mb.ashx

Others have said that Allen son of William Thrift is the Allen (middle initial T or A) Thrift b. ~1843 in SC who served with the 1 Palmetto Sharpshooters then moved to Shelby NC area, married Linsey Emiline Roberts and had kids including Allen Isaiah Thrift. Here are Allen's family and some descendants:
http://worldconnect.rootsweb.ancestry.com/cgi-bin/igm.cgi?op...

I am adding the info to my tree
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=DESC&... (William Thrift)

http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=DESC&... (Allen A. Thrift)

I would like to get YOUR detailed data and bring it to bear on this. Until we see better evidence that Allen who moved to NC is son of William of Newberry SC, I think it would be better to say his father is currently unknown. I think Allen might be in the line of John Thrift (see below) if only because of the repetitive name Allen in that line.
John Thrift b. 6 JAN 1760 in near Petersburg, VA , lived in Cane Creek, Pickens District, SC
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=DESC&...

Similarly I wonder if William Thrift (who has a son, Spencer) might be from the line of Abraham (& Spencer) Thrift, see below. Just speculation. Might be proven by DNA tests.
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=DESC&...

I would like to work out the connections of ALL the Thrift lines in SC and NC. My feeling is that they are all closely related, and further I'm guessing they are related to the Thrifts of Dinwiddie Co VA and to Joseph Frith of York Co VA.

Not to sound too much like a broken record, but DNA tests of male Thrifts would be an incredibly powerful way to make these connections. Are there any Thrifts who are willing to join the Thrift DNA Project to help work this out? We do already have results for a descendant of Isham Thrift of Orange Co, NC.

As Bob pointed out earlier on this message board, it is NOT safe to assume that any of these people descend from Richard Frith of Jamestown. I do feel that in the long term we may find more info about Richard Frith and his English relatives, and that based on THAT information we might eventually use DNA testing to see if any of the colonial lines appear related.

Richard Thrift