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Reimport Mesh on High Detailed skulpt

ZBrush Usage Questions
#1

Hello,

I need some help or at least some thoughts in solving my problem

I have a sculpted a head model. Its about 48 millions of polys with highest subdivision on level 7.
The problem is that I need to add Ear Sockets to it. When I reimport new base model on level 1 ZBrush crashed during reprojection every time. Then i try a trick with a TPoseMesh and TPoseSub, it allows me reimport modified model at least but due to a new vertices and vertex count it looks like a mess.

I’ve polygrouped a model, group split it, got my Ear Sockets and reimport it, but then those pieces have a slightly blurred and jagged edges, Projection method also gives not the best results on edges and on a mesh to .

Is it possible to somehow reimport the hole modified model? Also exporting map for just one piece is easier. My current machine have 40 Gb of RAM.
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#2

Your best bet is to export out your low, make your geo changes, import your new low as a new mesh (don’t override the old).
SubD up that new mesh and do a project all at each new subD level.
Clean up any projection errors.

Also, 48 million points for a single head is ton. That is way beyond micro pore level details.