It alleges corporate funds were used either directly or indirectly to pay for a golf and spa holiday in New Zealand, a $400,000 yacht, a plane, and trips to New Orleans and Rio de Janeiro.
The Australian newspaper reported this week an initial interlocutory hearing at the Federal Court in Melbourne has been postponed until June 16.
Campbell's solicitors have described the allegations as "not only completely denied but considered scandalous."
But lawyers for Fiat Chrysler are seeking to freeze Campbell's bank accounts, shareholdings and other properties and assets he and his wife own in Europe and New Zealand.
Campbell is no longer involved with Fiat Chrysler New Zealand, a private company he set up in partnership with Australasian car importer Neville Crichton, after he left Fiat Chrysler Australia.
The two were equal partners in the business until May, when Crichton took complete control of the company, as accusations against Campbell emerged.
A statement from Crichton's Ateco Group says: "Fiat Chrysler New Zealand is now a wholly-owned subsidiary or the Ateco Group. As soon as the company became aware of the accusations a mutually agreed settlement was reached. Clyde Campbell has no involvement and no interest in Ateco.
"Fiat Chrysler New Zealand is now operating as business as usual, as is the Ram trucks project."
Ateco announced plans earlier this year to import American Ram trucks, convert them to right-hand drive, to sell in the New Zealand and Australian markets.