Mass Quote Change

We are on Vantage 6.1. We are currently in the process of changing our
costs on manufactured parts to ALL customers. This means all customers
want a new quote send to them showing the change in price. What is the
best way to do a massive update of quotes?

Example: For a date range (last fiscal year) we need to change the cost
on every line quote for Part ABC for Customer XYZ.

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