Referencing cell on PLAN2 to a new expanded sorted cell on PLAN1. How ?

Hi.

Thank you all for this incredible board. This is my first post.

How can I keep referenced cells on Planilha2 pointing to correct Planilha1!B column cells when do an expanded sort on Planilha1!A column?
Example : in the attached file you can see that

Planilha2
C2 = =A2*Planilha1!B1

If I do an extended sort on Planilha1!A column, all values on Planilha1!B will change the row position and the referencing cells on Planilha2 will be lost.

How can I keep them referenced ?

Thank you all!!!