There is the option for creating the preload from a another step of the analysis. As Dyna Dynasupport website explained:
" A "dynain" file contains a set of keyword data that can be inserted into an input deck in order to initialize deformation, shell thickness, element history variables (stress, plastic strain, material-model-dependent extra history variables), and tensorial strains. LS-DYNA will write a dynain file at the end of an analysis if the keyword command *INTERFACE_SPRINGBACK_LSDYNA is included in the input deck (see Users Manual for command syntax). Alternately, LS-Prepost can write a dynain file corresponding to any output state stored in the D3PLOT database by selecting Output > dynain ASCII. "