Nested Heirarchical Multi-Channel Tool Schematics

Software
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I am so confused by the multi-channel tool.

I have a complicated 24 channel amplifier with schematic hierarchy shown below.

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Each individual output unit is a full page schematic, and I need to group them to pair with output connectors and input control signals per set of six.

I was able to follow the instructions in other forum posts to create rule areas, and was even able to make six of them based on a single output unit to quickly test component placement. It worked fine for replicating one output channel to the other five.

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But when I try to draw a rule area around all six units to represent a 6 Driver Channel schematic page, it doesn’t let me select it. It seems to only recognize lowest-level heirarchical pages as valid for placement.

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I’m lost in how to tell KiCAD that it should place different “levels” of rule area. What I want is that after placing these lowest-level rule areas and laying them out, I can replicate the placement of those lowest-level rule areas inside a middle-level rule area representing a 6-channel unit for a total of 24.

Is this possible? I expected that using nested heirarchical schematics would be recognized as nested layout patterns but I can’t figure it out. Maybe it is too ambitious, I tried using the HeirarchicalPCB extension instead, but it doesn’t work in v9. I’m willing to jump through a lot of hoops but this tool feels like it’s just not possible.

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What version are you using? The tool didn’t initially work for nested schematics but this was fixed in 9.0.2

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To add - can you share the project, or a sharable reduced example showing this issue? It may be that in your ‘6 Driver Channels’ sheets there aren’t actually any symbols directly in the sheet (only within the child sheets). I think that might stop the sheet being shown in the list.

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Thanks, this created items in the list for the middle level.

I didn’t get it to work the way I expected, but I should try harder before asking for more help.

My instinct was to define a rule area for the output unit, and then define a rule area around both of those rule areas for the “6 channel output” middle level. I was able to replicate the rule area for a single output unit and that worked great, but getting the lowest-level rule areas to automatically place inside the middle-level rule area gave a mismatch issue. I think I can figure it out, but putting an actual physical component onto the middle level sheet made it an option in the list.