Forms :: Two Text Boxes / Save The First Two Letters Of Each Input?

I want to be able to have two text boxes on my form that firstly concatenate the values inputted and then saves this string to a field.

It's a "new record" form that generates a new record in table "tblUsers".

txtB1 & txtB2 and the text boxes would represent First Name and Last Name.

But it can't be allowed to be saved as the acctual names. - Insead I'm looking for a way to take the first two or three letters of the name and concatenate these into one string of text and save that string to the field tblUsers.ConcatenatedName.

I.E.txtB1:"Carl"
txtB2:"Chapelle"

would generate "CarCha" and save that from the form to the field ConcatenatedName in tblUsers.

Btw, the values form txtB1 and txtB2 (Carl & Chapelle) cant be saved anywhere either!

Found the answer myself;

create a txtB3

And set that source to Left([txtB1];3) & " " & Left([txtB2];3)