QB Issue Resolution:

It quite simple go to item list open the activities list from the activities button bottom middle burtton. now select change item prices.

Resolution for Issue 'Can I have a % price rise across all products in the product list for sales & purchase prices?' available: Yes (Solved).
Source: Intuit Community forum.

Can I have a % price rise across all products in the product list for sales & purchase prices?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for item list
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Error Recovery for item list [Canada]
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