A1 = 1234567890 B1 = 100
A2 = 2314738298 B2 = 200
A3 = E2335 B3 = 50
A4 = ABC123 B4 = 25


SUM all items in A-column that has 10 digit numbers
result would be in this case A1+A2 = C1
C1 = 300