We need native system variables (similar to Document.Value) that automatically calculate the net total and tax total across all pricing tables in a document.

Business Case:
Currently, Document.Value provides the gross total across all tables, but there's no equivalent for net totals or tax totals

Users with multiple pricing tables (one per page/product) need these calculations without manual formula setup

This would improve consistency and reduce setup complexity for multi-table documents
Net and tax totals are as fundamental as gross totals for business documentation

Current Limitation:
While Document.Value sums gross totals across all pricing tables, users must manually create custom fields with formulas to calculate net totals and tax totals. This requires technical knowledge and extra configuration steps.

Expected Behavior:
Add system variables like:
Document.NetTotal (sum of all pricing table net amounts)
Document.TaxTotal (sum of all pricing table tax amounts)

These would work automatically, just like Document.Value, without requiring custom field setup or formulas.