Multiple Projects in one Integrated Schedule - How to show baselines in Gantt Chart

glad i could help 

if you are just showing LOE then do this

copy the project

filter where activity type not equal to LOE

next deleted all these activiites (all you are left with are the LOE activities)

now change all of the Actvitiy type to Task Dependent

for all of these add a primary constraint START ON and make the date equal to the planned start date 

for all of these add and expcted finish constraint equal to whatever the date was originally

recalcute the schedule chnanging the data date to whatever the baseline data date was 

now go into your current schedule select Project Maintain Baselines and selet Add and select the project you just created

now selet Project assign baseline and select the project that you just created

now filter where activity type eqauls LOE

now right click in the gantt area and select bars

in the bar setting make sure to show the Primary Baseline bar 

DONE 

In P6, each project requires its own baseline project (set under PROJECT>MAINTAIN BASELINES), and then you have to one-by-one for each project select which is the Project, Primavera, Secondary etc. baseline project.

Bear in mind that baselines are displayed by comparing Activity ID, you need the same ID in both the current and the baseline project for the baseline bar/milestone to be displayed.

In your example, if all your LOE's and and milestones are in one single project anyway, you could just create baselines of this one project with each of the LOE/Milestones showing the "past" date you want to show.