Wheat grain yield (GY) needs to be improved and breeding involving crosses between elite germplasm is a cornerstone of the process. Identifying promising parents is thus one of the important choices by breeders to increase the likelihood of obtaining transgressive segregation and increasing the rate of genetic gains. For such selection, knowing traits of the lines provide information that may link wheat developmental and yield determination traits. Therefore, improving understanding of complex trait combinations would converge towards practical breeding programs. In this study we evaluated a set of 231 lines selected from a panel of a 1200 NAM population generated from 13 bi-parental crosses consisting of elite lines (mainly Paragon crossed to lines of the CIMCOG population and of elite CIMMYT material). These 231 lines were selected for good field performances beyond minor differences in anthesis date and plant height, to increase the likelihood of identifying traits that may not be masked by these two traits. Two field experiments were conducted in NE Spain following augmented design using three checks (Paragon, Garcia and Paledor) that are commercial cultivars. Consistency in time to anthesis, plant height was as expected and a moderate consistency for average grain weight and harvest index (HI) was found when compared results from both seasons. On the other hand, a large GxE interaction was observed for GY and GN. We found significant relation between GY and GN, in turn GN was mainly driven by differences among lines in spike number per m2, with minor contributions from grain number per spike and spike dry weight at anthesis. The influence GY on HI was considerably higher than total biomass. Further analysis on selected lines with stable GY over two years resulted in well characterised elite lines for complex traits and trait combinations which will be promising in breeding for improved GY.