I haven't tried it myself, but a bit of googling led me to it. Sounds pretty straightforward. At least mostly I guess people seem to get hung up on the placeholder
I have done couple of PS2 games for HEN. You need to use PS2ClassicGUI (Not sure if can link to it, but should find easy on psx-place site). Once downloaded, you have to convert the .iso of your game to a ISO.BIN.ENC, which is what a PS3 can recognize. From here you have two possible ways.
Install PS2 Classic Placeholder pkg (again, on psx-place site should be easy to find), transfer the ISO.BIN.ENC to your PS3 and put into the /dev_hdd0/PS2ISO/ folder. After that, when using multiman/webman, it should mount that iso on the PS2 Classic Placeholder and you can launch it from there. I've never tested this way, because I did them back when HAN was used.
Still using PS2ClassicGUI, you can create a pkg that can be installed as any normal pkg, and that should work fine (this way I did a couple and worked with no problem)
I rememeber reading not so long ago, you can do all the ISO.BIN.ENC directly on PS3 using Apollo Save Tool. Transfer all your PS2 .iso files to /dev_hdd0/PS2ISO/ folder, and in Apollo, go to "User Tools", then "Encrypt PS2 ISO from system Storage" which should create a ISO.BIN.ENC, and you can proceed with the 1st option I mentioned on the list.
Bear in mind, this use much more limited emulation than using CFW PS2 emulator, and of course, PS3 BC. The list of compatible games is shorter, but you can check in here if the game you're interested work or not (the list is for CFW emulation, so some games that appear as playable could not be on HEN).
For CFW: /PS2ISO and refresh Webman . For Hen, an alternative to using a PC is to have Apollo Save Tool encode your PS2 ISOs. Then refresh Webman and load the PS2 Placeholder app from Webman, if memory serves. It's more complicated for Hen systems because Hen doesn't affect the PS2 kernel. But The native PS2 emu works with properly encoded 'store purchased' PS2 games.
Not multiman itself, but for my situation (CFW slim PS3), new version of evilnat CFW included a small program to download the PS2/PSP enablers compatible with it. From there, with multiman and FTP, there would be a directory on the internal hard disk of the PS3 you could then put the ISOs into. Not as lucky yet with most PSP, but PS2 and PS1 have worked well this way.
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