How to move old business assets under job-related expense to Self-employed?

My husband I always file MFJ.  He used to work for an employer (Michigan) but worked from home (California).  At that time, he had some business assets (unreimbursed, desk/chair/printer/second monitor etc).  I reported those under unreimbursed job-related expenses back then (2012-2014).  In 2015, he left the company and started his own consulting firm (self-employed).   I totally forgot about those old business assets and never moved those to SE business asset section even though he's been using those at the same % for his SE business.  Now, I realized that job-related expense deduction has been suspended.  I wonder if there's any way to move those to SE section without triggering any issue.    Any suggestion?   I also need to place them in the right place when I dispose those assets at some point in the future.