G12 is empty !!I wish that in G11 and G12 cells
=SUM(F3:(OFFSET(INDIRECT(ADDRESS(MATCH("Subtotal",F:F,0),6)),-2,0)))
=(SUM(F3:(OFFSET(INDIRECT(ADDRESS(MATCH("Subtotal",F:F,0),6)),-2,0))))*0.18
= LET(
taxRate, 18%,
quantity, CHOOSECOLS(table1, 4),
unitCost, CHOOSECOLS(table1, 6),
price, quantity * unitCost,
subtotal, SUM(price),
GST, taxRate * subtotal,
VSTACK(subtotal, GST, subtotal+GST)
)