I have two form FormA and FormB . Where in the FormA there is a String field "TV station" and this "TV station" field is used as a lookup field of FormB. 

What I would like to do is when user adds a new TV Station in the FormA and will it automatically insert a Records in the FormB 

Since in the formA TV station is the string field  and in the FormB "TV Station" is a lookup field so I am getting error, Could any one please help me ?

FormA:

FornB: