EXCEL - help to sum a column based on information from another column (Conditional Sum?)

Need help with an EXCEL formula.  I need could from one column based on an answer fro another column.  For example; I need to count all the estimated hours for Phase II.  Phase II is indicated by "Yes" in the Phase II column.  

Estimate        Phase II
------------         -----------
30                     No
40                     Yes
60                     Yes
42                     No

Subtotal for Phase II = 100
Subtotal for Phase I = 72
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Roy CoxGroup Finance ManagerCommented:
Do you mean SUMIF?

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Roy CoxGroup Finance ManagerCommented:
Pleased to help
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