You can lock pipe after it has been positioned to meet your design requirements.
You can lock piping component placement individually, or lock an entire line by line number.
Locked Component
When you lock component placement, modifications to connected components will not move the locked component. You are allowed to modify the properties of a component that has locked placement. You can also change component location if you edit the component directly (for example: using the Move grip).
A component with locked placement displays a lock glyph when it is selected.
If you move a connected part the axis of the locked part does not change. Locked pipe can be shortened (or lengthened) to accommodate new fittings, but the axis does not change. If you move parts that are connected to a locked pipe segment, one or more jogs are inserted, if necessary, to avoid breaking the connection.
Locked Line Number
When you lock a line, you cannot modify the location or properties of any component in the line. This is similar to the line being on a locked layer.
When piping is locked by line number, the line number displays a lock glyph in the ribbon.
You can lock a line number in Data Manager, or in the Isometrics tab of Project Manager.