The role of metadata in scientific research cannot be overstated as it helps to organize, preserve and enhance the value and usability of vast amounts of documents, thereby improving their traceability and understanding. Despite its importance, documenting metadata is often a time-consuming task for researchers, especially for 3D projects that contain, beyond the 3D data, all the related documents. To prevent the loss of traceability of these resources, it is essential to simplify the metadata documentation process. The consortium "3D for Humanities", labeled by Huma-Num since 2014, has taken major steps to tackle this challenge by researching the most effective way to document massive 3D data and simplify the 3D deposit project, both in the French National 3D Data Repository in the fields of Humanities and Social Sciences which offers publication services, and at the C.I.N.E.S. (National Computer Center for Higher Education) which offers long-term archiving of electronic data. The tedious task of documenting metadata for 3D projects highlights the need for simplification. To effectively document, it is important to not only provide information about the document itself through its metadata, but also to link project files together. Traditional web-based interfaces cannot achieve this simplification, but it can be done through specialized software. With this in mind, the consortium "3D for Humanities", has developed aLTAG3D, an open source software aimed to be as automated as possible to document 3D research projects and thereby reducing the amount of information that the researcher will have to fill in manually. The software uses a graphical user interface to make documenting data for archiving and publication more user-friendly. Users simply drag and drop to construct the package, object-by-object, by attaching sources and filling in the requested metadata at all levels. Some information will be extracted automatically, while others will be filled in manually. At the end of the process, on one hand, we get a hierarchical folder containing all the information and comprehensible data for future users and on the other hand, an XML file of the metadata, a file compatible with the archive at C.I.N.E.S. More metadata schemes may be introduced in a xsd format.