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Thank you for the reply! I think it is high time for me to move on from SOPC to QSYS, right? I guess SOPC builder may not have the above feature.
(The templates menu to add the type of instruction to the IP core). I checked the SOPC and I could not see that tab.
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Yes, you should use Qsys. I believe even if you launch SOPC Builder in the latest edition, it will give you a "Not recommended for new designs" type of message.
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And you mean to say you rely on the hw_*.tcl file scripting than the GUI based SOPC builder?
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Yes, but this is only my personal preference. If you search on here, you will find people having trouble using the graphical Component Editor so I know I am not alone. The TCL is not complicated (but unfortunately for custom instructions, I can't find a TCL reference).