The wealth of observational data from multiple spacecraft currently in operation at different locations around the inner heliosphere can set constraints to the morphology and properties of various solar and heliospheric structures, such as coronal mass ejections (CMEs), coronal holes, active regions, prominence eruptions, streamers, extreme-ultraviolet waves, co-rotating interaction regions, to name a few. The propagation behavior of transient structures (e.g. CMEs) is governed to a high degree by the ambient magnetic field and plasma flow, in which these structures are embedded, and which have important effects on the geo and planetary-effectiveness of these transients. The key parameter to determine the ability of CMEs to disturb the planetary plasma environments are their magnetic and dynamic properties. However, current limitations of predicting solar wind parameters, in particular the magnetic field vectors in Earth-impacting CMEs, severely restrict the accuracy of long lead-time space weather forecasts. In addition, the preconditioning of interplanetary space has immediate consequences for predicting the arrival times and impact speeds of CMEs and is, therefore, an important parameter for both terrestrial and planetary space weather forecasting. This session aims at a synergy and discussion of methods based on combining multi-point observations, theory and modeling for predicting the magnetic and dynamic properties of CMEs and the structuring of the interplanetary space. These studies help to obtain enhanced understanding how these transient structures propagate, evolve and affect the planetary plasma environments.