That is a long topic. I tried to look for you in epicweb to see if there was a guide that lays it out for you. The best I found was the EpicorICETools_UserGuide_YOURVERSION. If you look at that guide and find the section about how to create a BAQ report using ssrs you may start to understand how the report works.
Basically you have a report data definition (this supplies the data), you have a report style (this is where you set the path of the report, what report data definition it uses, and other settings), and then you have the ssrs report file itself (a .rdl file).
For your situation you need to modify the report file itself (the .rdl) since you aren’t trying to change the data (the report data definition) and you aren’t trying to modify the report style settings. You are trying to modify how it displays which is all handled in the .rdl file.
Are you familiar with the report style menu item or the report data definition menu item?
The report style menu is where you would go to look up the OrderAck report and see where the report style points to. In other words, you go here to see where the report location is.
NEVER modify the standard reports. Always make a copy of it using actions>Copy report style.
Do you have teams Daniel? We could also do a webex if you need more help.