Fields can get buggy quickly. You could look into an excel file link but I haven't done it often enough to know how well it could apply or how stable the link would be in your case...others here probably can chime in on that.
If your standard detail files are individual dwg files per detail and have some sort of standardized file names (let's say just "DTL123.dwg, "DTL124.dwg" etc.), a possible approach would be to create a block of each detail dwg with attribute text for the name. The details can have a standardized "frame" or bounded area with the name already within the block in your company's standard format they use for labeling detail sheets. Detail numbers could be embedded in the block as well by using a text attribute, this would allow the user to only input the detail number and not modify the name.
A completely different route that might be strange but still effective, would be to create a dynamic block with only the detail title and related framing (if used) for the detail borders etc. Each dynamic block should cover a "category" of details with a simple selection command on right-click that lists 5-10 detail names they can pick from...the selected name would then be displayed. A simple lisp could be written to insert the block and even the associated detail from a common filepath where you store them. I suggest 5-10 per block so users don't have a giant list of every detail in one block of all the detail name text entities...
Maybe with some sleep I could give you more straightforward answers but I'm sure someone else has better ideas. 🙂
