Hi,
I think you can export all reference spectra into a single folder from MS-DIAL. Then you can import all these spectra into MS-FIDNER and then export to a *.msp file. I suggest you put positive and negative spectra into two folders so that you can finally get positive and negative libraries separately. Once, you have new reference spectra processed by MS-DIAL, then you can export to the same folder and re-import into MS-FINDER to export the latest *.msp file.
Another thing is that you can use the post-identification function in MS-DIAL. For example, I prepare a *.txt file (see below. please follow the MS-DIAL tutorial) for post-identification, where I put the name, InChIKey, Formula, SMILES, Adduct, and corresponding m/z (it is important as MS-DIAL use it for identification), but leaving RT as -1. currently, I only consider M+H, M+Na, M+K, M+NH4, 2M+H, 2M+Na, 2M+K as well as 2M+NH4 for positive mode. With all this information, you can easily check which feature could be the true one for your reference standard and the exported spectra will contain this meta-information as well. Otherwise, you will have to manually add meta information for each spectra in MS-FINDER.
You can also use LIMA software for the management of you *.msp libraries.
Best,
Qizhi Su