Subashni JUGYEONG SHIN Making components independent will allow you to move 1 solid but that will inadvertently remove the instance relationship which i often needed and that will impact the BOM. If you move 1 bolt and all duplicate bolts move, that is because you are moving the solid. Moving the solid of 1 instance moves the solid of all instances (intentional).
You want to select the component and move that., These videos show some best practices in selecting and moving components, vs solids vs sub-assemblies
Move parts independently in assembly file