since in the other table you'll have the same column names A, and B then auto concatenate will be applied by QlikView i.e. the two records will be added to original table
you can either do the following :
load * resident original_table where B='test'
this way you'll have two tables but if you keep them you'll end up with synthetic keys
so you need to delete either of them
or you can do the following:
load A as Field1, B as Field2