Hi Richard I will do my best to answer your question but there are a lot of them.
Usually it is better to post a single question per thread so that something is not missed. A question with multiple parts can be very confusing for everyone
To question 1 that looks like it might be from the topology and relationship viewer is this correct?
What version of UIM and UMP are you running.
The point in USM to change managed or not was removed.
This is a simple field in the cm_computer_system table that can be updated manually.
https://www.ca.com/us/services-support/ca-support/ca-support-online/knowledge-base-articles.tec000004713.html
To question 2 you can use other probes to collect snmp information. This really depends on your needs.
Many clients still use snmpget and snmptd. most have replaced interface_traffic with snmpc.
I would suggest reviewing this:
SNMP Device Self-Certification - CA Unified Infrastructure Management Probes - CA Technologies Documentation
to question 3 there is no template for discovering devices. But you can use wild cards and scopes.
Run Discovery in USM - CA Unified Infrastructure Management - 8.4.7 - CA Technologies Documentation
to question 4 please see doing a discovery reset by cs_key KB article below:
to question 5:
You need to provide more details on what problems you are having
the commands are pretty strait forward I think.
Basically you are using the java keytool to create an java keystore and then create an SSL cert request that you
send off to your CA to they can create the cert and then it can be imported.
Some basic information on SSL is below:
SSL 101 for Dummies: Everything You Need to Know
You might always want to review this with your company webmaster or Web server admins they should be able to help fill in any blanks for you.