JKinzenbaw
It may take me one week to develop such a routine with friendly user interface (I am using AutoCAD VBA)
What this routine can achieve
1. Take your file and automatically populate your 500 monuments in predefined block with insertion X, Y, Z value extracting from Excel, plus descriptor as block's attribute
2. All populated blocks in ACAD are linking to Excel and by clicking on any of them in ACAD you can get a dialog box showing which row, col it's linking
3. If you update any value in Excel, the corresponding block's X, Y, Z and attribute value will get updated when you open this drawing or by clicking on Update menu. That means changing of X,Y,Z in Excel will move the block in ACAD automatically
You may drop me an email at info@cadtool.net to discuss further