I have two form FormA and FormB. 

FormA has  a  field -- Group Name

FormB has three fields below

TV station 

Group Name -- this field is the lookup field from FormA

Type

There are already records in these two forms.But now what I want to do is adding new field "Google Search" in the

FormA in addition of existing field "Group Name"  and delete all data from FormA and import the data  again with two  fields.

But problem is that when I delete all data from FormA then it will automatically delete all corresponding value from FormB -- lookup field.

Is there any way that without doing anything in formB I can import the data in FormA.