In the company profile there should be a secondary line where a company can input there DBA. This would ideally help to improve searchability when contractors are unaware that the company is operating under a DBA and do not know the companies primary name. If it is possible to then choose a "Network Display" name this would also improve searchability.
The reason the DBA cannot be the regular display name is to ensure that the profile matches tax documents, which often display the primary company name followed by the DBA, hence both need to be present and accounted for within the BuildingConnected Profile.
I can see that this may be possible within TradeApp (image attached). If this could also be made available in BuildingConnected, this would help solve this issue.