Step 1.
read here to add google microsoft mapbox near map manually to arcgis pro
https://transparentgov.net/cleargov1/2072/google-microsoft-nearmap-openstreet-mapbox-arcgis-direct
assume you already create these layers in arcgis pro.
Step 2.
share layer as layer file, or layer package both works. only difference is layer package is automatically upload to arcgis online. Layer file, you have to save on your hard drive, then menually upload item on arcgis online.
Step 3.
This is share as layer package, will automatically upload to arcgis online.
Step 4.
Step 5.
if share as layer file, you have to save it on hard drive, then upload layer file to arcgis online later
Step 6.
upload layer file to arcgis online
Step 7.
drag drop layer file to here
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Step 10.
microsoft map is on arcgis online, from arcgis pro, you can see both layer, layer-package
Step 11.
both layer package and layer file can be add to current map.
Step 12.
do the same thing on other maps, 
Step 13.
Step 14.
arcgis pro,all other maps are available now
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