asp.net core add multiple data with one click

I have a table with Id and Status as string. The user can enter two or more text and with a click of a button they should be all written to database. So far I tried to have this

        

            
Root Causes - Identification
        
        

            

                
            
        
        

            

                
            
        
        

            

                
            
        

        

            
                Add RCA Category
            
        
    

public async Task OnPostAddRCAMainAsync(string idinv, string app)
        {
            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
            var orgid = await _context.UsersData.Where(a => a.Id == userId).Select(a => a.OrgID).SingleOrDefaultAsync();
            var idrca = await _context.InvestigationRCAs.Where(s => s.OrgID == orgid && s.IdINV == idinv).Select(s => s.IdRCA).FirstOrDefaultAsync();
            var newRCAMain = new RCAMain()
            {
                IdRCA = idrca
            };
            if (await TryUpdateModelAsync(newRCAMain, "RCAMain",

                s => s.Status

            ))
            {
                _context.RCAMains.AddRange(newRCAMain);
                await _context.SaveChangesAsync();
                return RedirectToPage("/SRM/Investigation/RCA", new { idinv, app });
            }
            return Page();
        }

but no Status is added, only the IdRCA