I've not done this myself and I've no idea of your IT skills but here are a few suggestions.

I would use a spread sheet and use column A for the Asset name. If required use column B and C for the filename and runtime location. I would then go across with the page and frame location. Keep it simple an just put an x in a cell if the asset is used.

If you want to keep the layout compact then make the spread sheet mimic the project- make a WorkSheet tab at the bottom for each page for easy flipping between pages. You can copy and paste Column A from one worksheet to another to save retyping the asset names

After adding several asset lines you can sort them in name order- make sure you select ALL the cells (except the headings) before sorting. In Exel you define your data as a table to make this easier

If you have more data than one screen then you can keep your row/column headings on screen by selecting the first cell you want to scroll and us Freeze Panes (in View toolbar if using Exel )

As above, check out using Tables if you're an Exel user

Use the same workflow as Poser- save on a regular basis and Save As with a modified filename if you're not sure about a change - no Undo :)

Poser 11 , 180Gb in 8 Runtimes, PaintShop Pro 9
Windows 7 64 bit, Avast AV, Comodo Firewall
Intel Q9550 Quad Core cpu,  16Gb RAM, 250Gb + 250Gb +160Gb HD, GeForce GTX 1060