[Q] Filter Showing LOE and Every Related Tasks to the LOE?

given that you can filter on just about anything (in activity view, which is what I assume you are talking about...), the answer is 'yes'...

as to how, it could be as simple as creating a filter to only show the specific Activity ID's you wish to see, or using a common identifier in another field, like a common word in Activity Name or creating an Activity Code (or even UDF) for this purpose.

Use the Filter and Trace Logic.

create a new activity code 

filter for that one loe

look at the precedessor window and look for the one that has driviing checked 

highlight that predecessor

at the bottom click on the GOTO button

keep doing this until you get back to the data date or the project start date 

now highlight all of these and right click and select assign then activity codes and assign all of these to the new code that you just created

now filter for the new activity code.