The two projects are linked together

Member for

16 years 3 months

you have 2 options

option #1 choose 1 schedule as the master and then import the other 2 schedules into that master. 1st I would recommend making the activity ids unique in each project this can be done by using a gloabl change and adding a prefix to the current activity id. This way there can not be any duplicates and you know the source of the original data. You can also use this to filter by. i.e filter where activity ID begins with ENG 

lets say that the Engineering schedule will be the master so every activity id will begin with ENG- so an existing activity id let's say it is now 1000 will be ENG-1000

go to the Engineering schedule and runa global change and add a prefix of ENG- to the activity id

tools global change 

where Activity ID is not equal to 0

then Activity ID  = Click on {Custom} then where it says <enter text>  type ENG- & Activity ID

go to the Procurement schedule and run a global change and add a prefix of PROC- to the activity id

where Activity ID is not equal to 0

then Activity ID  = PROC- & Activity ID

go to the Construction schedule and run a global change and add a prefix of CON- to the activity id

where Activity ID is not equal to 0

then Activity ID  = CON- & Activity ID

export the xer files for the Procurement schedule and the construction schedule 

Open the Engineering scheule and import the Procurement schedule during the importing process select add to existing

Import the Construction schedule  during the importing process select add to existing instead of create new

now you can link the activities together

option #2

open all 3 schedules at the same time by holding the control key and seleting them now that they are all open you can link activities between the different schedules.

when you get an update from either of then duing the importing process you just select update existing instead of create new 

this way the links will still be there and jsut the data is updated.