I have created Parting line and parting surface as per requirement, But when using ToolSplit feature to separate in to core and cavity, It shows error "Cannot Knit sheets together". Part and error snapshot already attached for reference.
Look at your parting line surface in the areas pointed to below.
That may be your problem.
I think it is better to use other surface tools and features to create blow mold, than mold tools
Mold tools are mainly for injection molds to create core, cavity and other actions
For blow mold, you just need a cavity split and no need of core, I believe
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